EXPOSURE TIME (HOURS)

8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0

Engine Noise Hazard Areas
Figure 202

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 71-00-00
 ALL  ú ú N01A Page 211 ú Jun 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////

No. 3 Bearing Buffer Air Cooler
Figure 203

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 71-00-00
 ALL  ú ú N01A Page 212 ú Jun 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 862-064-N00
 CAUTION: DO NOT APPLY THE DEICING FLUID INTO AN ENGINE IN OPERATION.
_______ THE DEICING FLUID WILL CAUSE CONTAMINATION OF THE AIRFOILS AND DETERIORATION OF THE ENGINE PERFORMANCE CAN OCCUR.
 (1)  
Do not apply the deicing fluid into an engine in operation.

 J.
X-Rays

 S 862-065-N00
 CAUTION:_______DO NOT LET THE EEC AND SCU GET NEAR X-RAYS. A LARGE QUANTITY OF X-RAYS CAN CAUSE DAMAGE TO THE EEC AND SCU.
 (1)  
Remove the electronic engine control (EEC) and the supplemental control unit (SCU) before the engine gets near the X-rays.

 K.
Fuel and Lubricant Oils

 S 862-067-N00
 (1)  All fuel and lubricant oils can dry the skin. You must use all precautions to not get these fluids on your skin.
 TASK 71-00-00-802-002-N00
 3. Power Plant Operation Limits
____________________________
 A. Starter Operation Limits
 S 862-068-N00
 (1)  Each starter is supplied with low pressure air to start and motor the engine. This air is supplied through the pneumatic manifold from one of three sources. The three sources are as follows:
 -an engine in operation,
 -
the ground supply units for the low pressure air,

 -
the auxiliary power unit (APU) on the airplane.

 S 862-069-N00
 (2)  The starter cycle limits are in the steps that follow:
 (a)  The normal duty cycle is two starts, which were tried one after the other, followed by some time to continuously motor the engine to decrease the temperature. After the second time the start and motor was done, you must disengage the starter and let the N2 decrease to zero before you engage the starter again.
 NOTE: If you motor the engine before you do the starter duty
____ cycle, it is not necessary to disengage the starter before you try to start the engine.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 71-00-00
 ALL  ú ú N02A Page 213 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
CAUTION:_______DO NOT ENGAGE THE STARTER AT A SPEED MORE THAN 15% N2. IF YOU DO THIS, DAMAGE TO THE STARTER CAN OCCUR.
 (b)  If the starter is not engaged, it is recommended that you do not engage the starter at a speed of more than 15% N2.
 NOTE: The speed of 15% N2 is recommended to decrease the
____ quantity of worn areas of the starter.
 (c)  If an engine start is stopped (aborted) at more than 48% N2, you must let N2 decrease to less than 5% N2 before you try the next start.
 NOTE: This will remove power from the EEC and reset the EEC
____
 overspeed protection logic.

 (d)  
The starter duty cycles which are extended and the cooling limits to motor the engine (with the fuel and ignition OFF and the FUEL CONTROL switch in the CUTOFF position) are as follows: 1) 0 - 5 minutes ON - Disengage the starter and let the N2

 speed decrease to zero before you engage the starter again. 2) 5 - 10 minutes ON: Stop for 20-minutes to let the starter decrease in temperature. 3) 10 - 15 minutes maximum ON: Stop for 30-minutes to let the starter decrease in temperature.
　
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 動力裝置 POWER PLANT 1(15)