S 816-062-C00
(2)
Obey the instructions given for each area as follows:
(a) If the point is in area A:
1) If you find that the N1 rotor stopped during the hot start, do the borescope inspection procedure for the 1st-stage LPT blades.
2) A maximum service extension of one start is permitted.
a) If that start is a normal start, one cycle is permitted before you must do the troubleshooting procedure to find and correct cause of the hot start (AMM 71-00-41/101).
b) If that start results in another hot start, you must do the troubleshooting procedure to find and correct the problem before the next flight (AMM 71-00-41/101).
(b) If the point is in area B, do these steps before the next flight: 1) You must do a borescope inspection of the HPT blades and
the 1st-stage LPT blades. 2) Do the trouble shooting procedure to find the cause of the hot start (AMM 71-00-41/101).
3) A maximum service extension of one start is permitted and, if that start is satisfactory, 1 cycle is permitted before you must correct the problem.
(c) If the point is in area C, do these steps before you start the engine again: 1) Do the borescope inspections of the HPT blades and the
1st-stage LPT blades. 2) Do the trouble shooting procedure to find the cause of the hot start (AMM 71-00-41/101).
E. Engine Overtemperature - Not Starting (Fig. 611).
NOTE:____ There can be many causes of an EGT overtemperature. Some examples
are:
- N1 overboost
- Too much air bleed
- Engine deterioration
- Temperature inversion during the takeoff
-Engine warm up time is not sufficient before the takeoff.
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CFM56 ENGINES
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970
965 955 950
945 940 930 920 910 900
895 890 880 870 860 850 840 830 820
EGT `C
S-M56-MM-1884-03-B
Exhaust Gas Temperature (EGT)
Overtemperature Inspection Requirements (Except Starting)
Figure 611 (Sheet 1)
F08975
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
EGT `C
970
965
960
955
950
945
940
1
935
930
1 ON AIRPLANES WITH EGT TRANSIENT OVERTEMPERATURE CAPABILITY OR SERVICE BULLETIN, NO MAINTENANCE ACTION IS NECESSARY WHEN THE EGT MAXIMUM IS BETWEEN 930` AND 940`C FOR LESS THAN 20 SECONDS 925 WHEN TAKEOFF OR GO-AROUND POWER IS SET. REFER TO BOEING SERVICE LETTER 737-SL-72-006 FOR MORE INFORMATION.
S-M56-MM-02471-00-B
Exhaust Gas Temperature (EGT)
Overtemperature Inspection Requirements (Except Starting)
Figure 611 (Sheet 2)
C76047
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Engine Operations Above the Limits and High Engine Stress Inspection
_____________________________________________________________________
S 976-148-C00
(1)
Put a point on the graph to show the maximum EGT and the time the EGT was over the redline limit.
S 816-149-C00
(2)
Follow the instructions given for each area where the point is found:
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