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Output Number
IR19990019
Approval Date
Published Date Time
Recommendation type
Interim recommendation
Mode
Aviation
Date released

The Bureau of Air Safety Investigation recommends that Boeing
Commercial Airplane Group alert Boeing 737 operators to this safety
deficiency and implement an appropriate inspection program.



As a result of investigation into this occurrence, the Bureau
simultaneously issues the following interim recommendations:



IR990020



The Bureau of Air Safety Investigation recommends that Boeing
Commercial Airplane Group review the effectiveness of Service
Bulletin 737-32A1224.



IR990021



The Bureau of Air Safety Investigation recommends that the Federal
Aviation Administration note the above safety deficiency and
interim recommendations and take appropriate action as considered
necessary to ensure the integrity of Boeing 737 main landing gear
actuator beam arm assemblies.





IR990022



The Bureau of Air Safety Investigation recommends that the Civil
Aviation Safety Authority initiate appropriate action to ensure
that Australian operators of Boeing 737 aircraft immediately
inspect all main landing gear actuator beam arm assemblies for
evidence of cracking.



IR990023



The Bureau of Air Safety Investigation recommends that Australian
operators of Boeing 737 note the above safety deficiency and
interim recommendations and take appropriate action as considered
necessary to ensure the integrity of Boeing 737 main landing gear
actuator beam arm assemblies.

Organisation Response
Date Received
Organisation
Boeing Co
Response Text

Recommendation IR990019 says that BCAG should alert 737
operators to the safety deficiency and implement an appropriate
inspection program. In response to this, we have released Boeing
All- Operator Message M-7200-99-02383 dated 26 March 1999; a copy
of this is enclosed for your reference (see enclosure 2). In
summary we plan to release an alert service bulletin (737-32A1314)
by the end of April, 1999. This bulletin will call for the
resumption of the ultrasonic inspections of all Main Landing Gear
Beam Arms every 600 flight cycles upon the accumulation of 10,000
cycles or 4 years (whichever comes first). This will be considered
interim action until we have analyzed and implemented the course of
terminating action to preclude the onset of corrosion noted in the
parts.