(b) Do troubleshooting for "EGT OVERLIMIT" (Ref. TSM 77 PB 101).
1 Troubleshooting can be deferred for 10 cycles unless the fault
_
repeats.
(c) You can have a maximum of 20 overtemperature conditions in Areas A and B together or 10 overtemperature conditions in Area B alone, before engine removal is required.
R (4) Area C: (Unserviceable)
(a) Remove and return engine to a shop facility to examine damage.
(b) One non-revenue flight for fly-back is permitted before the engine must be removed, if there is no damage above the serviceable limits:
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1 Do a borescope inspection of the HPT blades and stage 1 LPT
_ blades (borescope port S17) (Ref. TASK 72-52-00-290-001) and (Ref. TASK 72-54-00-290-005).
2 Do a troubleshooting for "EGT OVERLIMIT" (Ref. TSM 77 PB 101).
_
R (5) If the maximum EGT is more than 950 deg.C, the EGT maximum pointer must be set again after the corrective action is done (Ref. TASK 77-00-00-710-042).
Subtask 72-00-00-280-062
C. Checks to be Performed when Abnormal Rotation Speeds are Reached
(1) Overspeed
(a) The speed limits are as follows:
1 Fan speed (N1): 104 percent
_
2 Core speed (N2): 105 percent
_
(b) Fan (N1) overspeed inspections:
1 If fan is operated at speeds from 104 percent to 105.8
_ percent, the engine must be inspected as follows:
- Review available data to understand reason for the overspeed.
- Correct the cause. Troubleshoot.
- Visually inspect the engine inlet, the fan blades, the exhaust nozzle, and the stage 4 LPT blades.
- Check the fan rotor for freedom of rotation and shingling of blades (Ref. TASK 72-21-00-210-005).
- Inspect abradable material in fan inlet case for rubbing (Ref. TASK 72-23-00-210-003).
- Borescope inspect the stage 5 of booster rotor blades (borescope port S05 at 3:30 o'clock location and at the rear end of booster) (Ref. TASK 72-21-00-290-003).
- Borescope inspect stage 1 LPT blades (borescope ports S16 and S17) (Ref. TASK 72-54-00-290-005).
2 If fan speed exceeds 105.8 percent, remove engine and return
_ to shop for overspeed inspection.
3 If fan speed has exceeded 104 percent the N1 max pointer must
_ be reset after corrective action has been performed (Ref. TASK 77-00-00-710-042).
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(c) Core engine (N2) overspeed inspections:
1 If core engine rotor is operated at speeds from 105 percent to
_ 105.8 percent the engine must be inspected as follows:
- Inspect exhaust nozzles for particles.
- Borescope inspect stages 1, 3, and 8 HPC blades (borescope ports S2, S4 and S9) (Ref. TASK 72-31-00-290-002).
- Borescope inspect HPT blades (borescope ports S16 and S17) (Ref. TASK 72-52-00-290-004).
2 If core engine rotation speed exceeds 105.8 percent, shutdown,
_ remove engine and return to shop for overspeed inspections.
3 If core engine rotation speed has exceeded 105 percent the N2
_ max pointer must be reset after corrective action has been performed (Ref. TASK 77-00-00-710-042).
Subtask 72-00-00-210-064
D. Checks Required after Lubrication System Operation Limits are Exceeded
(1) Oil pressure
(a) The Figure gives the relation between oil pressure and N2 speed.
(b) Critical zone A, with oil pressure lower than 13 psi (0,90 bar).
1 If engine operation with no oil or very low pressure has
_ exceeded any one of the following, remove engine and return to shop.
- Take-off power for 10 seconds.
- Cruise power for 10 seconds.
- Idle (flight or ground) for 30 seconds.
2 If engine not exceeding time limits per step 1_ has been
_ operated with no oil pressure or very low pressure, remove all oil filters, screens, magnetic plug and chip detectors, and check for presence of metal/debris. If no suspect metal debris is observed, troubleshoot.
(c) Zones B and/or C: Troubleshoot.
(2) Supply Oil Temperature
(a) Maximum oil temperature for continuous engine operation is 140 deg.C (284 deg.F).
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