747-400 AMM 飞机维护手册 动力装置 POWER PLANT 1(17)

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D. Overtemperature Limits (TT4.95) and the Necessary Inspection (Fig. 204).
 S 862-072-N00
 CAUTION: TO DECREASE THE RISK OF AN OVERTEMPERATURE CONDITION, YOU MUST
_______ QUICKLY MOVE (IN LESS THAN ONE SECOND) ALL THRUST LEVERS REARWARD FROM THE HIGH POWER. YOU MUST ALSO DO ALL ENGINE OPERATION FOR MAINTENANCE FUNCTIONS, WHICH "BLEEDS CLOSED DATA" IS NOT NECESSARY, AT POWER LEVELS LESS THAN THE 2.5 BLEED CLOSED POSITION (APPROXIMATELY 75% N1).
 (1)  During the engine operation, you can see a possible overtemperature condition occur if the fuel flow, high compressor rpm or temperature increases in large quantities.
 (a)  
When you think an overtemperature condition will occur or has occurred, you must let the engine become cool and do the engine shutdown (normal) procedure.

 (b)  
It is not recommended to do the emergency shutdown procedure unless more operation will cause more engine damage.

 (c)  
If the EGT was not more than the EGT limits, you can start the engine again with the Engine Start After An Emergency Shutdown procedure.

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 862-073-N00
 (2)  Exhaust Gas Temperature (EGT), Station 4.95 Harness Average
 (a)  The Maximum EGT which is permitted at Station 4.95 for the applicable condition during the engine operation is found in Table 201 and Fig. 204.
 ~............................................................... | Table 201 | | Maximum Permitted EGT | ................................................................. | | | Max. Harness Average | | Operation Condition | Time Limit | (Tt 4.95) | ................................................................. | Take-off | 5 minutes | See Figure 204 | | | *[1] | | ................................................................. | Max Continuous | Continuous | 625°C (1157°F) | ................................................................. | Start (On Ground) | -| 535°C (995°F) | ................................................................. | Start (In Flight) | -| 650°C (1202°F) | | | *[2] | | ................................................................. | Acceleration | -| 650°C (1202°F) | | | *[2] | | ................................................................. | Max Reverse | -| 650°C (1202°F) | | | *[2] | | 2.......................….............….........................1 *[1] THE NORMAL 5 MINUTE TAKEOFF TIME LIMIT MAY BE EXTENDED
 TO 10 MINUTES FOR AN ENGINE OUT CONTINGENCY.
 *[2]  LIMITS INCLUDES EGT SHUNT OF -4°C FOR ENGINES
 POST-PW-SB 73-166 AND SUBSEQUENT ENGINES.

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`F -20  0  20  40  60  80  100  120  140 
-(28.9)`C  (-17.8)  (-6.7)  (4.4)  (15.6)  (26.7)  (37.8)  (48.9)  (60) 
AMBIENT TEMPERATURE 
(TAMB) 

EGT IN THIS AREA AT ZERO M
N WILL BE AN OVER TEMPERATURE AT INCREASED M .
N
EGT IN THIS AREA WILL BE AN OVER TEMPERATURE WITH INCREASED AMBIENT TEMPERATURE.
MAXIMUM REVERSE EGT GUIDELINE IS
SAME AS THE TAKEOFF EGT GUIDELINE. L-A3320
Exhaust Gas Temperature (EGT) Guideline Figure 204
U24166
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