B.
References
(1)
AMM 45-10-00/201, Central Maintenance Computer System
(2)
AMM 71-00-02/401, Power Plant
(3)
AMM 71-11-04/201, Fan Cowl Panels
(4)
AMM 71-11-06/201, Core Cowl Panels
(5)
AMM 74-21-01/601, Exciter-to-Igniter Plug Cable
(6)
AMM 78-31-00/201, Thrust Reverser System
(7)
FIM 71-00-00/101, Power Plant
C.
Access
(1)
Location Zone
412 Engine 1 - Engine
422 Engine 2 - Engine
432 Engine 3 - Engine
442 Engine 4 - Engine
(2)
Access Panel 415 and 416 Thrust Reverser Halves - Engine 1 425 and 426 Thrust Reverser Halves - Engine 2 435 and 436 Thrust Reverser Halves - Engine 3 445 and 446 Thrust Reverser Halves - Engine 4
D.
Procedure
NOTE: The applicable inspections and steps are written in the paragraphs
____ after the inspections for Figures 602 and 603 are referred to.
S 976-065-N00
(1) Get access to the engine exceedance (ENG EXCD) EICAS maintenance page (AMM 45-10-00/201) to find the highest EGT that occurred and the quantity of time during the overtemperature.
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`C
570
560
D A B C
NORMAL START
5 10 15 20 25 27.5 30 35 37.5 40 45
EXHAUST GAS TEMPERATURE (TT4.95)(PEAK TEMPERATURE)
550
545
540
535
530
520
TIME - SECONDS
1
(TOTAL TIME ABOVE 535`C)
____DO THE INSPECTION FOR AREA C IF AN IN-FLIGHT RESTART HAS AN EGT OF 650`C OR MORE.
NOTE:
PLOT A POINT AT MAXIMUM EGT ATTAINED VS DURATION OF OVERTEMPERATURE
(AMOUNT OF TIME WAS ABOVE 535`C). FOLLOW THE INSTRUCTION L-A3318
APPLICABLE TO THE AREA IN WHICH IT LIES). 0888
Engine Overtemperature Inspection Requirements
(Ground and In-Flight Starting, Including Engine Operation Below Idle Speed)
Figure 602
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OVERTEMPERATURE - DURING ENGINE OPERATION (MINUTES)
EXHAUST GAS TEMPERATURE (T14.95) (SEE NOTE 3)
(PEAK TEMPERATURE)
AND UP
`C
680
675
670
665
660 655 650 645 640 635 630 625
0
AND UP SEE NOTE 2
TIME - MINUTES
TIME OF OVERTEMPERATURE - MINUTES
(TOTAL TIME ABOVE TAKE-OFF OR MAXIMUM CONTINUOUS LIMIT)
TAKE-OFF LIMIT, MAXIMUM REVERSE LIMIT.
MAXIMUM CLIMB, MAXIMUM CONTINUOUS LIMIT. CONTINUOUS OPERATION IS PERMITTED AT OR BELOW THIS LIMIT.
NOTE 1: THE TAKE-OFF LIMIT IS APPLICABLE FOR THE FIRST FIVE MINUTES (FROM THE START OF TAKE-OFF). AFTER FIVE MINUTES, THE MAXIMUM CLIMB, MAXIMUM CONTINUOUS LIMIT IS APPLICABLE FOR NORMAL OPERATION. THE TAKE-OFF LIMIT CAN BE EXTENDED FOR 10 MINUTES FOR EMERGENCY IN SERVICE USE.
NOTE 2: SEE SHEET 4 OF THIS FIGURE IF TIME OF OVERTEMPERATURE IS IN THE 0 TO 60 SECOND RANGE.
NOTE 3: EEC OUTPUT EGT TEMPERATURE INCLUDES 4`C SHUNT. FOR ENGINES PRE-PW-SB 73-166, ADD 4`C TO TEMPERATURE LIMITS. L-B7466 (0899)
Engine Overtemperature Inspection Requirements (At or More than Idle Speed) Figure 603 (Sheet 1)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
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