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Interim Recommendation issued to: Boeing Co

Recommendation details
Output No: IR19990019
Date issued: 19 March 1999
Safety action status:
Background: Why this Interim Recommendation was developed

Output text

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.

Initial response
Date issued: 06 April 1999
Response from: Boeing Co
Action status: Closed - Accepted
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.

 
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Last update 01 April 2011