FAA grounds 787

I dunno, how about a series of hamsters in a parallel set wheels?

Cheers
 
More 787 teething pain:

Although the challenge of addressing many of these issues pales by comparison with the engineering resources involved with solving the battery problem, at least one concern with the operation of the auxiliary power unit (APU) has prompted Boeing and the unit's manufacturer, Pratt & Whitney Aero Power, to undertake a design revision. Operators have discovered that after the APS5000 APU is shut down with the inlet door closed after landing, heat continues to build up in the tail compartment. After 20 min., this causes the rotor shaft to bow, and the shaft takes up to 2 hr. to straighten again.
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Source
 
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I didn't read the article in detail, but rotor bow is normal after shutdown. In the G-V the crew motors the engines to introduce cool air and monitors the vibration gage until it falls to acceptable limits.
TangoWhiskey said:
More 787 teething pain:



Source
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wabower said:
I didn't read the article in detail, but rotor bow is normal after shutdown. In the G-V the crew motors the engines to introduce cool air and monitors the vibration gage until it falls to acceptable limits.
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This seems to be more of an issue with the cooling door to the APU compartment. The article mentioned the interplay between that issue and the LiON battery... the APU door needs constantly applied power to stay open--the battery is exhausted after just 15 minutes of trying to hold the door open, so ground power is required. Kill the ground power, and the door automatically closes, regardless of the switch setting in the cockpit. Crazy.
 
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