Ford F-550 (2022 year). Manual in english — page 38
AUXILIARY SWITCHES
The auxiliary switchboard on the overhead
console makes aftermarket customization
easier with six prewired switches
connected to the power distribution box.
Each circuit is individually fused for
connection of electrical accessories.
E220728
The switches are labeled AUX 1 through
AUX 6. They only operate when the ignition
is in the on position, whether the engine is
running or not. We recommend that you
leave the engine running to maintain
battery charge when using the switches
for an extended time or when using higher
current draw accessories. When a switch
is turned on, the indicator light on the
switch illuminates and the circuit provides
power to the device wired to that switch.
Note:
AUX switch 1 is dedicated to the
off-road lamps when your vehicle is
equipped with this option.
E347548
There are three sets of blunt-cut and
sealed circuits. Two sets are under the
hood and behind the battery tray, and one
set is inside your vehicle at the passenger
footwell.
The powered set (A) is taped behind the
battery tray and is marked with a red spot
tape.
The second set (B) is also under the hood.
It is taped behind the battery tray and is
marked with a white spot tape. This set
routes to the interior passenger footwell.
Remove the battery and battery tray to
access the under hood circuits.
E347399
The interior set is taped on a wire harness
by the passenger side footwell. This set is
the other end of the circuits taped behind
the battery tray marked with a white spot
tape.
Remove the fuse panel access door in the
kick panel to access the wires. If you do not
see them, you may need to pull them
down.
See the Fuses chapter of your Owner’s
Manual for information on fuse and relay
locations. See your authorized dealer for
service.
616
Accessories
The relays are coded as follows:
Fuse
Wire Size
Passenger
Footwell
Wire Color
Under-
hood
Pass
Through
Wire Color
Power
Distribu-
tion Box
10A
1.0 mm²
AUX 1
Violet/Green
AUX 1
Violet/Green
AUX 1
15A
1.0 mm²
AUX 2
Green/Brown
AUX 2
Green/
Brown
AUX 2
15A
1.0 mm²
AUX 3
Green/Blue
AUX 3
Green/Blue
AUX 3
10A
1.0 mm²
AUX 4
Brown
AUX 4
Brown
AUX 4
5A
1.0 mm²
AUX 5
Blue/Orange
AUX 5
Blue/Orange
AUX 5
5A
1.0 mm²
AUX 6
Yellow/
Orange
AUX 6
Yellow/
Orange
AUX 6
617
Accessories
WHAT ARE THE AUXILIARY
SWITCHES
The auxiliary switchboard on the overhead
console makes aftermarket customization
easier with six prewired switches
connected to the power distribution box.
Each circuit is individually fused for
connection of electrical accessories.
LOCATING THE AUXILIARY
SWITCHES
The switches are labeled AUX 1 through
AUX 6. They only operate when the ignition
is in the on position or in the off position
when Delay Accessory is active, whether
the engine is running or not. We
recommend that you leave the engine
running to maintain battery charge when
using the switches for an extended time or
when using higher current draw
accessories. When a switch is turned on,
the indicator light on the switch illuminates
and the circuit provides power to the
device wired to that switch.
E220728
LOCATING THE AUXILIARY
SWITCH WIRING
E347548
There are three sets of blunt-cut and
sealed circuits. Two sets are under the
hood and behind the battery tray, and one
set is inside your vehicle at the passenger
footwell.
The powered set (A) is taped behind the
battery tray and has a red spot tape mark.
The second set (B) is also under the hood.
It is taped behind the battery tray and has
a white spot tape mark. This set routes to
the interior passenger footwell.
Remove the battery and battery tray to
access the under hood circuits.
E347399
618
Auxiliary Switches
The interior set is taped on a wire harness
by the passenger side footwell. This set is
the other end of the circuits taped behind
the battery tray, with a white spot tape
mark.
Remove the fuse panel access door in the
kick panel to access the wires. If you do not
see them, you may need to pull them
down.
Additional information on fuse and relay
locations is available. See
387). See your authorized dealer for service.
IDENTIFYING THE AUXILIARY SWITCH WIRING
The relays are coded as follows:
Fuse
Wire Size
Passenger
Footwell
Wire Color
Under-
hood
Pass
Through
Wire Color
Power
Distribu-
tion Box
10A
1.0 mm²
AUX 1
Violet/Green
AUX 1
Violet/Green
AUX 1
15A
1.0 mm²
AUX 2
Green/Brown
AUX 2
Green/
Brown
AUX 2
15A
1.0 mm²
AUX 3
Green/Blue
AUX 3
Green/Blue
AUX 3
10A
1.0 mm²
AUX 4
Brown
AUX 4
Brown
AUX 4
5A
1.0 mm²
AUX 5
Blue/Orange
AUX 5
Blue/Orange
AUX 5
5A
1.0 mm²
AUX 6
Yellow/
Orange
AUX 6
Yellow/
Orange
AUX 6
619
Auxiliary Switches
WHAT IS FORD PROTECT
Protect yourself from the rising cost of
vehicle repairs with a Ford Protect
extended service plan.
Ford Protect Extended Service
Plans - United States Only
Ford Protect extended service plans mean
peace of mind. Extended service plans are
backed by Ford Motor Company, and
provide more protection beyond the New
Vehicle Limited Warranty coverage. When
you visit your Ford Dealer, insist on the Ford
Protect extended service plan.
Ford Protect Can Quickly Pay for Itself
One trip to the service center could easily
exceed the price of your Ford Protect
extended service plan. With the Ford
Protect extended service plan, you
minimize your risk for unexpected repair
bills and rising repair costs.
Up to 1,000+ Covered Vehicle
Components
There are four mechanical Ford Protect
extended service plans with different levels
of coverage. Ask your authorized dealer for
details.
1.
PremiumCARE - Our most
comprehensive coverage. With over
1,000 covered components, this plan
is so complete it is probably easier to
list what is not covered.
2. ExtraCARE - Covers 113 components,
and includes many high-tech items.
3. BaseCARE - Covers 84 components.
4. PowertrainCARE - Covers 29 critical
components.
Ford Protect extended service plans are
honored by all authorized Ford dealers in
the United States, Canada and Mexico.
That means you get:
•
Reliable, quality service at any Ford or
Lincoln dealership.
•
Repairs performed by factory trained
technicians, using genuine parts.
Rental Car Reimbursement
First Day Rental Benefit
If you bring your car into your dealer for
service, we will give you a rental vehicle to
use for the day.
Extended Rental Benefits
If your vehicle is kept overnight for covered
repairs, you are eligible for rental car
coverage, warranty repairs, and field
service actions.
Roadside Assistance
Exclusive 24/7 roadside assistance,
including:
•
Towing, flat-tire change and battery
jump starts.
•
Out of fuel and lock-out assistance.
•
Travel expense reimbursement for
lodging, meals and rental car.
•
Assistance for taxi, shuttle, rental car
coverage or other transportation.
Transferable Coverage
If you sell your vehicle before your Ford
Protect extended service plan coverage
expires, you can transfer any remaining
coverage to the new owner. This should
give you and your potential buyer peace of
mind.
620
Ford Protect
Less Cost to Properly Maintain Your
Vehicle
The Ford Protect extended service plan
also offers a Premium Maintenance Plan
that covers all scheduled maintenance,
and selected wear items. The coverage is
prepaid, so you never have to worry about
the cost of your vehicle’s maintenance.
Covered maintenance includes:
•
Windshield wiper blades.
•
Spark plugs.
•
The clutch disc (if equipped).
•
Brake pads and linings.
•
Shock absorbers.
•
Struts.
•
Engine belts.
•
Engine coolant hoses, clamps and
o-rings.
•
Diesel exhaust fluid replenishment (if
equipped).
•
Cabin air filter replacement every
20,000 mi (32,000 km) for electric
vehicles only.
Interest Free Finance Options
Just a 5% down payment provides you
with an affordable, no interest, no fee
payment program allowing you all the
security and benefits Ford Protect
extended service plan has to offer while
paying over time. You are pre-approved
with no credit check or hassles. To learn
more, call our Ford Protect extended
service plan specialists at 800-367-3377.
Ford Protect Extended Service Plan
P.O. Box 321067
Detroit, MI 48232
Ford Protect Extended Service
Plan (Canada Only)
You can get more protection for your
vehicle by purchasing a Ford Protect
extended service plan. Ford Protect
extended service plan is the only service
contract backed by Ford Motor Company
of Canada, Limited. Depending on the plan
you purchase, Ford Protect extended
service plan provides benefits such as:
•
Rental reimbursement.
•
Coverage for certain maintenance and
wear items.
•
Protection against repair costs after
your New Vehicle Limited Warranty
Coverage expires.
•
Roadside Assistance benefits.
There are several Ford Protect extended
service plans available in various time,
distance and deductible combinations.
Each plan is tailored to fit your own driving
needs, including reimbursement for towing
and rental. When you purchase Ford
Protect extended service plan, you receive
added peace-of-mind protection
throughout Canada, the United States and
Mexico, provided by a network of
participating authorized Ford Motor
Company dealers.
Note:
Repairs performed outside of Canada
and the United States are not eligible for
Ford Protect extended service plan
coverage.
This information is subject to change. Visit
your local Ford of Canada dealer or
www.ford.ca to find the Ford Protect
extended service plan that is right for you.
621
Ford Protect
GENERAL MAINTENANCE
INFORMATION
Why Maintain Your Vehicle?
Carefully following the maintenance
schedule helps protect against major repair
expenses resulting from neglect or
inadequate maintenance and may help to
increase the value of your vehicle when
you sell or trade it. Keep all receipts for
completed maintenance with your vehicle.
It is important that you have your vehicle
serviced at the proper times. These
intervals serve two purposes: first is to
maintain the reliability of your vehicle and
the second is to keep the cost of owning
your vehicle down.
It is your responsibility to have all
scheduled maintenance performed and to
make sure that the materials used meet
the specifications identified in this owner's
manual. See
Failure to perform scheduled maintenance
and regularly inspect your vehicle may
result in vehicle damage not covered by
the vehicle Warranty.
Why Maintain Your Vehicle at Your
Dealership?
Our Genuine Replacement Parts
Dealerships stock our parts and our
authorized branded re-manufactured
replacement parts. These parts meet or
exceed our specifications. Parts installed
at your dealership carry a nationwide
24-month or unlimited mile (kilometer)
parts and labor limited warranty.
If you do not use our authorized parts they
may not meet our specifications and could
affect emissions compliance.
Protecting Your Investment
Maintenance is an investment that pays
dividends in the form of improved
reliability, durability and resale value. To
maintain the proper performance of your
vehicle and its emission control systems,
make sure you have scheduled
maintenance performed at the designated
intervals.
Your vehicle comes with the Intelligent
Oil-Life Monitor system, a message
appears in the information display at the
proper oil change interval. This interval
may be up to one year or 10,000 mi
(16,000 km), hybrid vehicles could exceed
10,000 mi (16,000 km).
When the oil change message appears in
the information display, it is time for an oil
change. Make sure you perform the oil
change within two weeks or 500 mi
(800 km) of the message appearing. Make
sure to reset the Intelligent Oil-Life Monitor
after each oil change. See
If your information display resets
prematurely or becomes inoperative, you
should perform the oil change interval at
six months or 5,000 mi (8,000 km) from
your last oil change. Never exceed one year
or 10,000 mi (16,000 km) between oil
change intervals.
You can drive high performance vehicles
in such a way that may lead to higher oil
consumption including extended time at
high engine speeds, high loads, engine
braking, hard cornering maneuvers, track
and off-road usage. Under these
conditions, oil consumption of
approximately 1 quart per 500 miles (1 liter
per 800 km) is possible. Check the engine
oil level at every refueling and adjust to
maintain proper levels to avoid engine
damage.
622
Scheduled Maintenance
It is important to rely upon your dealership
to properly diagnose and repair your
vehicle.
We strongly recommend only using our
genuine or our authorized re-manufactured
replacement parts engineered for your
vehicle.
Additives and Chemicals
We do not recommend using chemicals or
additives not approved by us as part of
your vehicle’s normal maintenance. Please
consult your warranty information.
Oils, Fluids and Flushing
In many cases, fluid discoloration is a
normal operating characteristic and, by
itself, does not necessarily indicate a
concern or that the fluid needs to be
changed. Have discolored fluids that also
show signs of overheating or foreign
material contamination checked
immediately.
Make sure to change the vehicle’s oils and
fluids at the specified intervals or in
conjunction with a repair. Flushing is a
viable way to change fluid for many vehicle
sub-systems during scheduled
maintenance. It is critical that systems are
flushed only with new fluid that is the same
as that required to fill and operate the
system or using our approved flushing
chemical.
Owner Checks and Services
Make sure you perform the following basic
maintenance checks and inspections.
Check Every Month
The air filter restriction gauge.
1
The engine oil level.
Function of all interior and the exterior lights.
The tires including the spare for wear and proper pressure.
The windshield washer fluid level.
The fuel and water separator. Drain if necessary or if indicated by the information display.
1
The holes and slots in the tail pipe to make sure they are functional and clear of debris.
1
1
Diesel vehicles only.
623
Scheduled Maintenance
Check Every Six Months
The battery connections. Clean if necessary.
The body and door drain holes for obstructions. Clean if necessary.
The cooling system fluid level and the coolant system strength.
The door weatherstrips for wear. Lubricate if necessary.
The hinges, latches and outside locks for proper operation. Lubricate if necessary.
The parking brake for proper operation.
The seatbelts and seat latches for wear and function.
Safety warning lamps, brake, ABS, airbag and seatbelt for operation.
The washer spray and wiper operation. Clean or replace blades as necessary.
Multi-Point Inspection
It is important to have the systems on your
vehicle regularly checked. This can help
identify potential issues and prevent major
problems. We recommend having the
following multi-point inspection performed
at every scheduled maintenance interval
to help make sure your vehicle keeps
running great.
Multi-Point Inspection
Hazard warning system operation
Accessory drive belt or belts
Horn operation
Battery performance
Radiator, cooler, heater and air conditioning
hoses
Engine air filter
Suspension components for leaks or
damage
Exhaust system
Steering and linkage
Exterior lamps operation
Tires including the spare for wear and
proper pressure
2
Fluid levels
1
; fill if necessary
624
Scheduled Maintenance
Multi-Point Inspection
Windshield for cracks, chips or pits
For oil and fluid leaks
Washer spray and wiper operation
Half-shaft dust boots
1
Brake, coolant recovery reservoir, automatic transmission and window washer.
2
If your vehicle has a temporary mobility kit, check the tire sealant expiration Use By date
on the canister. Replace as needed.
Be sure to ask your dealership service
advisor or technician about the multi-point
vehicle inspection. It is a comprehensive
way to perform a thorough inspection of
your vehicle. Your checklist gives you
immediate feedback on the overall
condition of your vehicle.
NORMAL SCHEDULED
MAINTENANCE - DIESEL
Oil Change Reminder
Your vehicle comes with an oil change
reminder that determines when you should
change the engine oil based on how you
use your vehicle.
Your vehicle lets you know when an oil
change is due by displaying a message in
the information display.
The following table provides examples of
vehicle use and its impact on oil change
intervals. It is a guideline only. Actual oil
change intervals depend on several factors
and generally decrease with severity of
use.
When to Expect the Message Prompting You to Change Your Oil
Vehicle Use and Example
mi (km)
Normal
7,500–10,000 mi
(12,000–16,000 km)
Normal commuting with highway driving.
No, or moderate, load or towing.
Flat to moderately hilly roads.
No extended idling.
Severe
5,000–7,500 mi
(8,000–12,000 km)
Moderate to heavy load or towing.
Mountainous or off-road conditions.
Extended idling, 200-300 hours.
Extended hot or cold operation.
625
Scheduled Maintenance
When to Expect the Message Prompting You to Change Your Oil
Vehicle Use and Example
mi (km)
Extreme
2,500–5,000 mi
(4,000–8,000 km)
Maximum load or towing.
Extreme hot or cold operation.
Use of high sulfur diesel fuel.
Note:
Use the appropriate special operating condition for maintenance information when
using high sulfur diesel fuels, operating your vehicle off-road or in dusty conditions, such as
unpaved roads.
Note:
For every hour that your vehicle idles, it accumulates the equivalent of approximately
25 mi (40 km).
Normal Maintenance Intervals
At Every Oil Change Interval as Indicated by the Information Display
1
Change the engine oil and filter.
2
Fuel and water separator. Drain if necessary or if indicated by the information display.
Refill the diesel exhaust fluid tank.
Rotate the tires, inspect the tires for wear and measure the tread depth.
4
Perform a multi-point inspection, recommended.
Inspect the air filter restriction gauge. Replace the air filter if necessary.
3
Inspect the brake pads, shoes, rotors, drums, brake linings, hoses and the parking brake.
Inspect the engine and secondary cooling system coolant concentration freeze-point
protection, level and the hoses.
Inspect the exhaust system and heat shields.
626
Scheduled Maintenance
At Every Oil Change Interval as Indicated by the Information Display
1
Inspect the front axle and U-joints. Lubricate any grease fittings. Four-wheel drive
vehicles.
Inspect the steering linkage, ball joints, suspension, tie-rod ends, driveshaft and the U-
joints. Lubricate any grease fittings.
1
Do not exceed one year/10,000 mi (16,000 km) or 350 engine hours between service
intervals.
2
Reset the Intelligent Oil-Life Monitor after engine oil and filter changes.
3
Reset the engine air filter information monitor after you replace the air filter.
4
Rotate the front wheels on vehicles with dual rear wheels when specified. Only rotate
the rear wheels if you notice unusual wear.
Brake Fluid Maintenance
1
Change the brake fluid.
2
Every three years
1
Perform this maintenance item every three years. Do not exceed the designated time
for the interval.
2
Brake fluid servicing requires special equipment available at your authorized dealer.
Other Maintenance items
1
Replace the cabin air filter.
Every 20,000 mi
(32,000 km)
Replace the engine air filter.
2
Every 30,000 mi
(48,000 km)
Replace the engine-mounted and frame-mounted fuel filters.
Inspect the engine and secondary cooling system coolant
concentration freeze-point protection, additive corrosion
inhibitor strength, coolant level, and hoses. Add coolant
additive if necessary.
Replace the engine air inlet foam filter.
Every 50,000 mi
(80,467 km)
Replace the front wheel bearing grease and grease seal if
using non-sealed bearings. Two-wheel drive vehicles.
Every 60,000 mi
(96,000 km)
Inspect the accessory drive belt or belts.
3
At 90,000 mi
(144,000 km)
627
Scheduled Maintenance
Other Maintenance items
1
Change the automatic transmission fluid and filter. Consult
dealer for requirements.
Every 150,000 mi
(240,000 km)
Replace the accessory drive belt or belts if not replaced
within the last 100,000 mi (160,000 km)
Replace the front wheel bearings and seals if using non-
sealed bearings. Two-wheel drive vehicles.
Change the axle(s) fluid. See exceptions.
Change the transfer case fluid, if equipped.
Change the engine and secondary cooling system coolant.
4
At 200,000 mi
(320,000 km)
1
You can perform these maintenance items within 3,000 mi (4,800 km) of the last oil
change. Do not exceed the designated distance for the interval.
2
Reset the engine air filter information monitor after you replace the air filter.
3
Perform follow-up inspections every 15,000 mi (24,000 km) after the initial inspection.
Replace the belt or belts at 150,000 mi (240,000 km).
4
Initial replacement at 10 years or 200,000 mi (320,000 km), then every 5 years or
100,000 mi (160,000 km).
NORMAL SCHEDULED
MAINTENANCE - GASOLINE
Oil Change Reminder
Your vehicle comes with an oil change
reminder that determines when you should
change the engine oil based on how you
use your vehicle.
Your vehicle lets you know when an oil
change is due by displaying a message in
the information display.
The following table provides examples of
vehicle use and its impact on oil change
intervals. It is a guideline only. Actual oil
change intervals depend on several factors
and generally decrease with severity of
use.
When to Expect the Message Prompting You to Change Your Oil
Vehicle Use and Example
mi (km)
Normal
7,500–10,000 mi
(12,000–16,000 km)
Normal commuting with highway driving.
No, or moderate, load or towing.
Flat to moderately hilly roads.
628
Scheduled Maintenance
When to Expect the Message Prompting You to Change Your Oil
Vehicle Use and Example
mi (km)
No extended idling.
Severe
5,000–7,500 mi
(8,000–12,000 km)
Moderate to heavy load or towing.
Mountainous or off-road conditions.
Extended idling, 200-300 hours.
Extended hot or cold operation.
Extreme
2,500–5,000 mi
(4,000–8,000 km)
Maximum load or towing.
Extreme hot or cold operation.
Use of high sulfur diesel fuel.
Note:
For every hour that your vehicle idles, it accumulates the equivalent of approximately
25 mi (40 km).
Normal Maintenance Intervals
10,000 mi (16,000 km)/ 450 Engine Hours or 12 Months - Whichever Comes First
Change the engine oil and filter.
1
Rotate the tires, inspect tire wear and measure the tread depth.
2
Inspect the wheels and related components for abnormal noise, wear, looseness or
drag.
Perform multi-point inspection - recommended.
Inspect the brake pads, shoes, rotors, drums, brake linings, hoses and the parking brake.
Inspect the engine coolant concentration, freeze-point protection, level and the hoses.
Inspect the exhaust system and heat shields.
Inspect the front axle and U-joints. If applicable, lubricate the grease fittings. Four-wheel
drive vehicles.
Inspect the steering linkage, ball joints, suspension, tie-rod ends, driveshaft and the U-
joints. If applicable, lubricate the grease fittings.
1
Reset the Intelligent Oil-Life Monitor after engine oil and filter changes.
2
Rotate the front wheels on vehicles with dual rear wheels when specified. Only rotate
the rear wheels if you notice unusual wear.
629
Scheduled Maintenance
Brake Fluid Maintenance
1
Change the brake fluid.
2
Every three years
1
Perform this maintenance item every three years. Do not exceed the designated time
for the interval.
2
Brake fluid servicing requires special equipment available at your authorized dealer.
Other Maintenance Items
Replace the cabin air filter.
Every 20,000 mi
(32,180 km)
Replace the engine air filter.
Every 30,000 mi
(48,000 km)
Replace the front wheel bearing grease and grease seal, if
you use non-sealed bearings.
Every 60,000 mi
(96,000 km)
Replace the spark plugs.
Every 100,000 mi
(160,934 km)
Inspect the accessory drive belt or belts.
1
Every 100,000 mi
(160,934 km)
Change the automatic transmission fluid and filter on 6-speed
transmission. Consult dealer for requirements.
Every 150,000 mi
(240,000 km)
Replace the accessory drive belt or belts if not replaced within
the last 100,000 mi (160,000 km).
Replace the front wheel bearings and seals if you use non-
sealed bearings.
Change the axle(s) fluid. See exceptions.
Change the transfer case fluid, if applicable.
Change the engine coolant.
2
At 200,000 mi
(320,000 km)
1
If not replaced, inspect the belt or belts every 15,000 mi (24,000 km).
2
Initial replacement at 10 years or 200,000 mi (320,000 km), then every 5 years or
100,000 mi (160,000 km).
630
Scheduled Maintenance
SPECIAL OPERATING
CONDITIONS SCHEDULED
MAINTENANCE - DIESEL
If you operate your vehicle primarily in any
of the following conditions, you need to
perform extra maintenance as indicated.
If you operate your vehicle occasionally
under any of these conditions, it is not
necessary to perform the extra
maintenance. For specific
recommendations, see your dealership
service advisor or technician.
Towing a Trailer or Using a Car-top Carrier
Change the engine oil and filter as indicated by the
information display, and perform the services listed in the
scheduled maintenance chart.
As required
See the axle maintenance items under
Exceptions
.
Replace the engine-mounted and frame-mounted fuel
filters.
Every 15,000 mi
(24,000 km) or six months,
600 engine hours
Replace the wheel bearing grease and grease seals if using
non-sealed bearings. (Two-wheel drive vehicles)
Every 30,000 mi
(48,000 km)
Flush and refill the coolant.
At 60,000 mi (96,000 km)
or 2400 engine hours
Note:
After the initial coolant flush and fill at 60,000 mi (96,000 km) or 2400 engine
hours, flush and fill every 45,000 mi (72,000 km) or 1800 engine hours thereafter.
Frequent or Extended Idling (Over 10 Minutes Per Hour of Normal Driving) or Frequent
Low-speed Operation if your Vehicle is Used for Stationary Operation
Change the engine oil and filter as indicated by the
information display, and perform the services listed in the
scheduled maintenance chart.
As required
Replace the engine-mounted and frame-mounted fuel
filters.
Every 15,000 mi
(24,000 km), six months or
600 engine hours
Flush and refill the coolant.
Every 60,000 mi
(96,000 km) or 2400
engine hours
Note:
After the initial coolant flush and fill at 60,000 mi (96,000 km) or 2400 engine
hours, flush and fill every 45,000 mi (72,000 km) or 1800 engine hours thereafter.
631
Scheduled Maintenance
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