20181006019509I

On October 6, 2018, N7261Y, a Piper PA-30, serial number 30-295, a CFI was performing touch and go?s with another pilot receiving a checkout in that make/model at the Phoenix Deer Valley Airport (dvt). At 1521 MST during the 3rd and last intended landing on runway 25L the aircraft experience a collapse of all 3 landing gear. There were no injuries and the aircraft suffered minor damage. An aircraft recovery crew raise the aircraft and the landing gear was observed to be partly extended. The landing gear was manually extended, however the right main gear would only extend ½ of the way down. An attempt was made to physically pull the right main gear down was unsuccessful. That gear was then forced back up into the wheel well. The aircraft was repositioned to the aircraft owner?s hangar on the field where it put on jack stands.

Both the CFI and the pilot in the left seat were interviewed. Both pilots stated they were positive that the landing gear was fully extended prior to touchdown and had no indication of any problems with the prior two landings.

An inspection of the aircraft revealed that the right main landing gear strut housing had broken away from the aft trunnion pin at the point the strut is bolted to the pin. The push-pull rod for the right main gear was bent at where it attaches to the gear torque tube, but it is not known if this occurred during the landing or was a result of the right gear being forced back into the wheel well during recovery of the aircraft.

Both brake calipers exhibited heavy abrasion at an angle on the lower outboard area of their housings consistent with the landing gear dragging on the runway while partly extended. The nose landing gear door also experienced heavy abrasion when it was wedged between the nose wheel and the runway surface. This damage would not have occurred if the landing gear were still in the retracted position during landing.