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A B737 pilot reports that in cold WX the locking pin on the B737 'combi' cargo door slides into the locked position prior to the door closing.
| Attributes | |
| ACN | 735034 |
| Time | |
| Date | 200704 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 735034 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Environmental Factor Aircraft Company |
| Primary Problem | Aircraft |
Narrative:
The locking pin on the cargo door continues to slide into the locked position before the door closes. There is tremendous stress when the door slams against the locks with the pin extended. This has been a problem from the beginning. Callback conversation with reporter revealed the following information: reporter stated that this and other passenger/cargo aircraft delivered to his air carrier since jan/sat/07 have a locking pin design that occasionally drops into the locked position prior to the cargo door closing. The reporter has observed this anomaly only in cold WX. When the event occurs the hydraulic door actuators attempt to close the door; putting tremendous pressure on the airframe.
Original NASA ASRS Text
Title: A B737 PLT RPTS THAT IN COLD WX THE LOCKING PIN ON THE B737 'COMBI' CARGO DOOR SLIDES INTO THE LOCKED POS PRIOR TO THE DOOR CLOSING.
Narrative: THE LOCKING PIN ON THE CARGO DOOR CONTINUES TO SLIDE INTO THE LOCKED POS BEFORE THE DOOR CLOSES. THERE IS TREMENDOUS STRESS WHEN THE DOOR SLAMS AGAINST THE LOCKS WITH THE PIN EXTENDED. THIS HAS BEEN A PROB FROM THE BEGINNING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THIS AND OTHER PAX/CARGO ACFT DELIVERED TO HIS ACR SINCE JAN/SAT/07 HAVE A LOCKING PIN DESIGN THAT OCCASIONALLY DROPS INTO THE LOCKED POS PRIOR TO THE CARGO DOOR CLOSING. THE RPTR HAS OBSERVED THIS ANOMALY ONLY IN COLD WX. WHEN THE EVENT OCCURS THE HYD DOOR ACTUATORS ATTEMPT TO CLOSE THE DOOR; PUTTING TREMENDOUS PRESSURE ON THE AIRFRAME.
Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.