(4)
Ground Low Pressure Air Supply Unit - Steward Davis Model 502
NOTE: If auxiliary power unit is used to start engines, items (4) and (5) are not required.
(5)
Interphone service equipment.
C. Prepare for Engine Operation
(1)
Remove engine inlet and exhaust covers.
(2)
Check nose cowl, engine inlet, exhaust duct and area around airplane for presence of foreign objects.
NOTE: Conscientious use of engine inlet and exhaust covers will minimize the possibility of foreign object damage to engines.
(3)
Before operating newly installed engine, remove all storage plugs, vent and drain caps, airtight moisture barriers, and humidity indicators from engine.
(4)
Check that fuel tanks are serviced and for water in tank sumps.
CAUTION: TO AVOID OVERHEATING AIRPLANE HYDRAULIC SYSTEMS, ENSURE THAT SUFFICIENT FUEL QUANTITY IS MAINTAINED TO COVER HYDRAULIC FLUID HEAT EXCHANGERS. THIS REQUIRES A MINIMUM OF APPROXIMATELY 1675 POUNDS (762 KG.) OF FUEL EACH IN TANK NO. 1 AND IN TANK NO. 2.
(5)
Check engine oil tank and airplane hydraulic reservoirs for adequate servicing
(Ref Chapter 12, Servicing).
(6)
Move battery switch to ON (forward overhead panel).
(7)
Start APU (Ref. Chapter 49, Airborne Auxiliary Power Unit), or connect external electrical power and low-pressure air supply line to airplane (Fig. 202).
(8)
On the forward overhead panel, move ground power switch to ON, if ground power is selected.
(9)
Turn ac meter switch to GND PWR or APU GEN as selected (forward overhead panel).
(10)
Place thrust levers in fully retarded position and start levers in CUTOFF position (Fig. 203).
(11)
Check the following items:
(a)
Fire switch fully down and locked (control stand).
(b)
Hydraulic lines are connected at engine (if new engine installed or work performed on hydraulic system).
(12)
Check that main landing gear wheels are chocked and all landing gear downlocks are installed.
(13)
Place parking brake in ON position.
CAUTION: TO MINIMIZE THE POSSIBILITY OF AIRPLANE SKIDDING DURING HIGH POWER OPERATION, THE FOLLOWING ADDITIONAL MINIMUM GROSS WEIGHT AND GROUND/TIRE SURFACE REQUIREMENTS MUST BE MET. FAILURE TO MEET THESE ADDITIONAL REQUIREMENTS COULD RESULT IN AIRPLANE SKIDDING WITH SUBSEQUENT AIRPLANE DAMAGE.
(14)
If one or both engines are to be operated at high power, the following requirements are recommended to minimize airplane skidding.
(a)
Ensure ramp and tires are free from contaminants.
NOTE: A damp ramp surface is acceptable. No standing water, frost, ice, oil, grease, sand, or other contaminants are permitted.
(b)
Ensure airplane satisfies minimum gross weight requirements as follows:
NOTE: For consistent results, the oil tank should be serviced within 2 hours after engine shutdown.
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Thrust Condition Minimum Gross Weight
One engine operating at takeoff thrust with opposite engine thrust at 0 to 1.2 EPR 79,000 pounds
Both engines operating at 80% maximum takeoff thrust (See Chart A for EPR at 80% of takeoff thrust) 63,000 pounds
Both engines operating at 100% maximum takeoff thrust 79,000 pounds
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(15) Review Fig. 201 and 201A for identification of engine hazard areas, entry and exit corridors, and personnel safety lanyard assembly (F80239) attach points. Awareness of hazard areas and proper entry/exit corridors is essential whenever maintenance tasks are performed around or near an operating engine. Use of both personnel safety lanyard and engine run-up inlet guard (C12001) are recommended, but not mandatory.
WARNING: USE EXTREME CARE WHEN OPENING OR CLOSING THE ENGINE SIDE COWLS WHILE THE ENGINE IS OPERATING. THE FORWARD COWL HOLD-OPEN RODS AND FORWARD COWL LATCHES ARE IN THE IDLE POWER INLET HAZARD ZONE. THE OPERATOR SHOULD STAY AS FAR AFT OF THE INLET AS WILL ALLOW OPERATION OF THE FORWARD HOLD-OPEN RODS AND LATCHES. THE ENGINE MUST BE AT GROUND IDLE.
WARNING: IF ENGINE SIDE COWLS HAVE NOT BEEN REMOVED FOR PERFORMING ENGINE TRIM, LEAK CHECKS, OR OTHER MAINTENANCE TASKS REQUIRING ENGINE OPERATION, DO NOT ENTER OR EXIT FROM FORWARD END OF SIDE COWLS. ENTERING OR EXITING FROM FORWARD END OF SIDE COWL WILL PLACE PERSONNEL IN ENGINE INLET HAZARD AREA, AND MAY CAUSE POSSIBLE PERSONNEL INJURY.
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