Squawk Box

September 2015 Issue




Strutting

The following information is derived from the FAA’s Service Difficulty Reports and Aviation Maintenance Alerts.

Beech/Raytheon G36 Bonanza

Misaligned Strut Attach Points

During landing gear retraction tests, it was noted the nose wheel assembly would contact the right nose gear door’s aft hinge during landing gear cycle. Also, the nose wheel assembly contacted the nose wheel well structure when fully retracted. Precision measurements determined the nose strut assembly-to-aircraft-structure attach points were misaligned.

Part total time: 124.0 hours



Cessna Model 172SP Skyhawk SP

Damaged Strut Retaining Pins

During routine inspection, the nose gear oleo strut was disassembled to replace O-rings. During disassembly, the technician found the inner strut tube at the top had damaged retaining pins, allowing the lower part of tube to be worked loose from the upper part. The only way to find this type of damage is to completely disassemble the nose strut.

Part total time: 1514.0 hours


Piper J3 Cub

Shock Strut Failure

Aircraft was flown for 45 hours on snow skis before the right shock strut broke during low-speed taxi. The right long shock strut broke halfway down the tube with no signs of previous cracking. Break occurred during compression of the shock strut by high side loads from heavy snow and ice.

Part total time: 5025.0 hours


Piper PA-28-140 Cherokee 140

Attach Point Failure

After landing, the upper link attach point failed on the main landing gear strut cylinder, p/n 65319-002. This failure caused the oleo strut to be ejected from the cylinder causing major damage to aircraft. SB 1311 addresses this.

Part total time: 7000.0 hours


Piper PA-44-180 Seminole

MLG Strut Failure

The left main strut failed during the takeoff roll, resulting in the gear collapsing. On inspection, there appeared to be a pre-existing crack, starting from the bolt hole that attaches the strut to the wheel housing. It should be noted this aircraft is used for flight training and probably has experienced hard landings on many occasions.

Part total time: Unknown


Taylorcraft BC-12D

Oversize Strut Attach Points

Mounting holes for new sealed front lift struts, STC SA02300AK, p/n AF-MA-A815, were measured to be 0.007-inch oversize. The replacement struts are intended to satisfy ADs 2007-16-14 and 2008-04-09. The STC holder was contacted about the problem but there was no resolution.

Part total time: 0.0 hours