Thrust Reverser Sync-Shaft Leakage

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February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1
Thrust Reverser Sync-Shaft
Leakage
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2
Thrust Reverser Sync-Shaft Leakage
Background
• Four operators reported 32 reports of hydraulic fluid leakage from sync
shaft tubing
 One operator reported total of 24 reports, with 17 reported in 2001
• Appear to be increasing trend with middle-to-older airplanes
• Leakage is always on lower sync shaft tube, P/N 315A1805-25
 All but one report has leakage at lower end of tube (at lower
actuator)
• Leakage appears to be specific to O-ring, P/N NAS1611-15, installed
between tube and tube adapter
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3
Thrust Reverser Sync-Shaft Leakage
Investigation Status
• Design similar to 737-300/400/500 and 757/PW2000 thrust reversers,
which have no reports of chronic leakage
• Investigating possible effects of new BMS3-11 LD4 and LD5 Skydrol on
installation
 Initial results show no affect
• Initiated investigation of installation
 Hampered by lack of returned hardware
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4
Thrust Reverser Sync-Shaft Leakage
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 5
Summary
• Boeing needs returned hardware to conduct full investigation
• Request operators that experience noted leakage to provide removed
hardware to local Field Service Representative for onward distribution
to Boeing
Thrust Reverser Sync-Shaft Leakage

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Thrust Reverser Sync-Shaft Leakage