Hello Mooney world,
General broadcast for insight into a recurring landing gear retraction issue. Yesterday the landing gear failed to retract for the 3rd time. My A&P (Andres Gonzales at Bill's Air Center at SMO) temporarily fixed the issue twice before. However, he has suggested I take the plane elsewhere for a repair. He reports the issue is very challenging to troubleshoot.
I purchased 43PG on Aug 30. On my initial checkout with Paul Kortopates, the gear failed to retract on the 4th take off at SMO. Andres troubleshot and identified the "Up" relay to the solenoid as the issue. Both the "up" and "down" relays were replaced. Andres reported "about 50" successful gear cycles on jacks in the shop. The plane was returned to service.
I completed my check out with Paul, putting about 20 additional cycles on the gear with no issues. The day after my sign off, I flew to Glendale, AZ about 1.6 hours at 15,500ft. On departure from GEU, gear did not retract. I elected to fly back to SMO (POH EP allows continuation of flight, if desired. I wanted Andres to troubleshoot and conditions were day VFR).
Andres identified a loose electrical connection at the wire into the solenoid. He reported replacing washers with lock washers (and stated the leads were tight in the inspection in the first repair). Plane was returned to service.
On Friday evening I put 5 cycles on the landing gear. Saturday morning the gear retracted fine (6 total cycles). On Saturday I flew to MMH (about 1.6 hours at 14,500 ft). Gear did not retract on departure from MMH. Very dangerous situation with density altitude at 9,500 ft. I landed at MMH to see if a landing cycle would reset/correct a limit switch or relay. Gear did not retract on next take off. Plane is currently at SMO.
Correlation is not cause, but are the >1 hour flights at higher altitudes related? Extremely concerning, costly, and inconvenient for this issue to appear the last 2x on long x-country trips.
Indications are always the same: Gear down light is lit the entire time; "Gear Unsafe" light never illuminates; mechanical indication is "Green/gear down".
My plane is going into annual and to fix a number of squawks at LASAR on November 20th. I'm concerned that even if they fix the issue, it will reappear after 5-20 cycles unless a root cause is identified and addresses.
Not sure what to check/investigate/do now. My A&P is out of ideas.