(b)
If the DUCT PRESSURE indicator on the Pilot's overhead panel P5 does not decrease during the start, examine the starter control valve for a frozen solenoid. 1) Use the manual starter valve override handle on the starter
control valve during the engine start to release the valve.
2) Apply hot air from an explosion-proof hot air source to release the strut valve or the high pressure bleed valve (121°C or 250°F maximum).
(c)
If an engine accelerates slowly after lightup and a hung start occurs, do the engine shutdown procedure. 1) Start the engine again with the procedure for normal engine
operation.
(d)
If the engine is slow to start, or will not accelerate to idle power (hung start), do the engine shutdown procedure and find the cause.
CAUTION: DO NOT TURN ON THE ENGINE ANTI-ICE SYSTEM IF THE ENGINE
_______ INLET IS NOT FULLY CLEAN OF ICE. AT TEMPERATURES COLDER THAN FREEZING, THE ANTI-ICE SYSTEM HAS SUFFICIENT HEAT TO MELT THE ICE AT THE INLET, BUT THE ICE AND WATER WILL MOVE IN THE ENGINE AND FREEZE AGAIN ON THE INLET ACOUSTIC PANELS AND ENGINE PARTS. IF ICE IS IN THE ENGINE, DAMAGE TO THE ENGINE CAN OCCUR.
(e) While the engine operates at idle power during icing
conditions, turn on the engine anti-ice system.
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71-00-00
ALL ú ú N02A Page 280A ú Oct 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
CAUTION: IF THERE IS NO OIL PRESSURE INDICATION (EICAS RED BAND)
_______ WHEN THE ENGINE HAS ACCELERATED TO MINIMUM IDLE OR THE OIL PRESSURE DECREASES TO ZERO DURING ENGINE OPERATION, DO THE PROCEDURE TO SHUTDOWN THE ENGINE AND FIND THE CAUSE OF THE PROBLEM. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE ENGINE CAN OCCUR.
CAUTION: WHEN THE ENGINE IS STARTED DURING VERY COLD CONDITIONS,
_______ THE OIL PRESSURE INDICATION CAN GO HIGHER THAN NORMAL BECAUSE OF HIGH OIL VISCOSITY. THE OIL PRESSURE WILL DECREASE AS THE OIL TEMPERATURE INCREASES. IF THE OIL PRESSURE DOES NOT DECREASE AFTER THE OIL TEMPERATURE BECOMES STABLE, DO THE PROCEDURE TO SHUTDOWN THE ENGINE AND FIND THE CAUSE OF THE PROBLEM. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE ENGINE CAN OCCUR.
(f) Operate the engine at idle until the oil temperature is 0°C (32°F) or more before you move the thrust levers forward and accelerate the engine from idle power. 1) Operate cold engines at idle power or taxi power until the
oil temperature is more than 50°C (122°F) before you go to takeoff power.
2) If you use this procedure to re-warm the engine, make sure the engine operates at idle power for a minimum of ten minutes before the engine is shutdown.
NOTE: Measure the ten minutes from the time that the
____ engine oil temperature is 0°C (32°F). These ten minutes are the minimum time for the engine temperature to become stable. You can increase the time periods between engine operations to re-warm the engine if you increase the engine run time to more than ten minutes or use a higher power level than idle power.
S 842-115-N00
(3) If you must do the Power Plant Tests in AMM 71-00-00/501, you must turn off the engine anti-ice system.
NOTE: To get good data from the power plant tests, you must operate
____ the engine with no electrical load on the IDG and no bleed air off-takes.
S 712-116-N00
(4) Stop the engine.
(a) Do the engine shutdown for normal engine operation.
1) Make sure the thrust reverser is retracted (the forward thrust position).
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