CAUTION: DO NOT DO AN EMERGENCY ENGINE SHUTDOWN WHEN THE EGT (T4.95) IS
_______ MORE THAN THE LIMITS, UNLESS THE OPERATION WHICH IS CONTINUED WILL CAUSE MORE DAMAGE. IF YOU DO A QUICK ENGINE SHUTDOWN, THE HIGH TEMPERATURE OF THE ENGINE CAN CAUSE DAMAGE TO THE ENGINE.
CAUTION: YOU MUST LET THE ENGINE OPERATE FOR FIVE MINUTES TO DECREASE
_______
THE TEMPERATURE. DO THIS INSTRUCTION UNLESS THE OPERATION
WHICH IS CONTINUED WILL CAUSE MORE DAMAGE.
CAUTION: DO NOT START THE ENGINE UNTIL THE INSPECTION SHOWS THE TWO
_______ ENGINE ROTORS TURN CORRECTLY AND THE APPLICABLE OVERTEMPERATURE INSPECTION IS DONE. IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN CAUSE DAMAGE TO THE ENGINE.
CAUTION: IF THE ENGINE HAS AN OVERTEMPERATURE CONDITION BECAUSE OF A
_______ STALL, YOU MUST DO THE EMERGENCY ENGINE SHUTDOWN PROCEDURE. IF YOU DO NOT DO THIS INSTRUCTION, MORE ENGINE OPERATION CAN CAUSE DAMAGE TO THE ENGINE.
(3) If the EGT (TT4.95) is more than the redline limit values given in Table 201, the engine had an overtemperature condition. The procedure you must do must agree with these conditions: the temperatures which were more than the limits, the quantity of time the temperature was more than the limits, and the condition in which the engine operated at the time.
NOTE: Make sure the overtemperature indication is set when the
____
overtemperature fault is corrected.
(a)
The overtemperature and inspection limits for an engine start are shown in Fig. 205.
(b)
Operation overtemperature and inspection limits, with takeoff included, are shown in Fig. 206.
E. Continue In Service Limit
NOTE: You can use the Continue In Service Limits which are in
____
AMM 72-00-00/601, with the applicable notes included.
S 862-075-N00
(1) The condition does not go more than the "Continue In Service Limit".
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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)
NOTE: DO THE INSPECTION FOR AREA C IF AN IN-FLIGHT RESTART HAS AN EGT OF 650`C OR MORE.
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 205 (Sheet 1)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
AREA CHART INSPECTION REQUIREMENTS
A turbine blades or vanes. metal particles. Examine the evidence of the distress on the pressure turbine for the burned residue, distortion, and the Do the visual inspection as follows: B. 2. A. Examine the exhaust sleeve, exhaust plug, and the aft of the low If the inspection is not satisfactory, do the borescope inspec-3. Correct the cause of the overtemperature with the procedure on the Surge Conditions was over the limit (Takeoff or Max Continues) (4) Steady-State or 1. Record: (1) Engine Serial No. (2) Max Temperature (3) Time the EGT Engine Parameters Abnormal (FIM 71-00-00/101, Fig. 103). tion (AMM 72-00-00/601, Engine Gaspath Inspection).
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