(a)
If the overspeed occurred in Area A, do the steps that follow:
NOTE: No action is necessary when the speed of N1 is between
____ between its redline and redline transient for less than 5 seconds.
1) Make sure the rotor turns freely.
2) Examine the inlet and exhaust ducts for unwanted materials.
a) If unwanted materials are found, remove them. 3) Examine the inlet and the exhaust ducts for damage. 4) If no damage is found, do the steps that follow:
a) Correct the cause of the overspeed.
b) Do the Test No. 3 - Ground Test - Idle Power (AMM 71-00-00/501) to make sure the engine operates correctly.
5) If damage is found, do the applicable borescope inspections or replace the engine (AMM 71-00-02/401) if necessary.
(b) If the overspeed occurred in Area B, do the steps that follow: 1) Make sure the rotor turns freely. 2) Examine the inlet and the exhaust ducts for unwanted
materials.
a) If unwanted materials are found, remove them. 3) Examine the inlet and the exhaust ducts for damage. 4) If no damage is found, do the steps that follow:
a) Correct the cause of the overspeed.
b) Do the Test No. 3 - Ground Test - Idle Power (AMM 71-00-00/501) to make sure the engine operates correctly.
NOTE: If the engine operates correctly, it can stay
____ in service for 60 hours.
After 60 hours, you must replace the engine (AMM 71-00-02/401).
5) If damage is found, do the applicable borescope inspections or replace the engine (AMM 71-00-02/401) if necessary.
NOTE: If the engine operates correctly, it can stay in
____
service for 60 hours.
After 60 hours, you must replace the engine (AMM 71-00-02/401).
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72-00-00
ALL ú ú N01 Page 629 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 5 - Engine Overspeed Inspection
___________________________________
(c) If the overspeed occurred in Area C, do the steps that follow: 1) Make sure the N1 indication system operates correctly
(AMM 77-12-00/501). 2) Remove the engine (AMM 71-00-02/401). 3) Refer to the Engine Manual to do a full inspection of the
engine parts that turn. The inspection must include the steps that follow: a) Remove the 1st-stage fan blades and the low pressure
compressor (LPC) to do a full overhaul inspection of the engine parts that turn. b) Examine the low pressure turbine (LPT) blades, disks, and shaft for growth.
NOTE: Growth is when parts change their dimensions
____ because of heat and force.
c) Examine the LPT blades for worn knife-edge seals. d) Do a fluorescent penetrant inspection of the LPT disks and blades for damage.
S 286-074-N00
(3)
Refer to Figure 604 to see the area that N2 operated at above its redline.
(a)
If the overspeed occurred in Area A, do the steps that follow:
NOTE: No action is necessary when the speed of N2 is between
____ its redline and redline transient for less than five seconds.
1) Make sure the rotor turns freely.
2) Examine the inlet and exhaust ducts for unwanted materials.
a) If unwanted materials are found, remove them. 3) Examine the inlet and exhaust ducts for damage. 4) If no damage is found, do the steps that follow:
a) Correct the cause of the overspeed.
b) Do the Test No. 3 - Ground Test - Idle Power (AMM 71-00-00/501) to make sure the engine operates correctly.
5) If damage is found, do the applicable borescope inspections or replace the engine (AMM 71-00-02/401) if necessary.
(b) If the overspeed occurred in Area B, do the steps that follow: 1) Make sure the rotor turns freely. 2) Examine the inlet and exhaust ducts for unwanted materials.
a) If unwanted materials are found, remove them. 3) Examine the inlet and exhaust ducts for damage. 4) If no damage is found, do the steps that follow:
a) Correct the cause of the overspeed.
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