Service difficulty report · Bolt · Beech B90

Difficulty date
August 15, 2004
Submitted
October 8, 2004
Operation
General aviation
Aircraft
N148Z
Make and model
Beech B90
Aircraft serial
LJ472
Engine
Pwa PT6*
System (JASC)
1430 · Fasteners
Part
Bolt
Condition
Loose
Location
Wing
Stage of operation
NR
How discovered
9
Nature of condition
W
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

INSPECTION AFTER TURBULENT AIR, DISCOVERED BOTH UPPER FWD WING BOLTS AND NUTS WERE ONLY INSTALLED HAND TIGHT. REVEALED THAT WING BOLT INSP HAD BEEN COMPLETED 116.8 HOURS BEFORE. WING BOLT RETORQUE CHECK HAD BEEN COMPLIED WITH 72.8 HOURS AFTER THAT. AIRCRAFT HAS WING STRAP INSTALLED. THE STC ICA AND SB ONLY MENTIONS PROCEDURES FOR TORQUEING THE LWR FWD BOLTS. PROCEDURE FOR TORQUEING REMAINDER BOLTS IS LEFT TO MFG SIRM. WING BOLT MAINT, SIRM STATES TO CHK TORQUE IAW FIGURES SHOWN. IT APPEARS THAT REQUIRED TORQUE COULD BE MET, EVEN THOUGH NUTS WERE NOT FULLY ENGAGED, OR CORRECTLY TORQUED TO BEGIN WITH, DUE TO DOWNWARD PRESSURE EXERTED ON WING. SIRM STATES (ENSURE WING IS PROPERLY SUPPORTED FOR MAINT).

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