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A B737-400 first officer and PIC disagree on the release provisions associated with an MEL procedure with an unreliable left pack in mmgl, first officer.
| Attributes | |
| ACN | 609924 |
| Time | |
| Date | 200402 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mmgl.airport |
| State Reference | FO |
| Altitude | agl single value : 0 msl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : preflight ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 609924 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | other |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Company Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
After parking at the gate at gdl we finished the shutdown checklist and the captain left to get the new paperwork. Shortly thereafter a left wing-body overheat light illuminated. I ran the QRH checklist which required the APU to be shut down. No jetway electrical power was available. We therefore had no AC power or communication capability on the aircraft. When the captain returned I explained what had happened and we rechked the QRH procedure to insure compliance. The captain then went to operations to contact maintenance control while I tried to arrange for a portable gpu. The captain returned and indicated that maintenance was going to defer the indicating system. I told the captain that I was not convinced it was the indicating system or that we were MEL'ing the correct problem. He returned to operations as we still had no power on the aircraft, and returned later. He said maintenance was aware of the problem and that we would return to lax without using the left pack or APU to preclude any further problem. I suggested that those items would also have to be MEL'ed and he responded that they did not and that the MEL we were using was correct. We received an amended release with the MEL and a new flight plan for FL240 for the single pack operation. As we were not using any bleed air from the affected side I was convinced that the confign was safe and complied with the captain's instructions.
Original NASA ASRS Text
Title: A B737-400 FO AND PIC DISAGREE ON THE RELEASE PROVISIONS ASSOCIATED WITH AN MEL PROC WITH AN UNRELIABLE L PACK IN MMGL, FO.
Narrative: AFTER PARKING AT THE GATE AT GDL WE FINISHED THE SHUTDOWN CHKLIST AND THE CAPT LEFT TO GET THE NEW PAPERWORK. SHORTLY THEREAFTER A L WING-BODY OVERHEAT LIGHT ILLUMINATED. I RAN THE QRH CHKLIST WHICH REQUIRED THE APU TO BE SHUT DOWN. NO JETWAY ELECTRICAL PWR WAS AVAILABLE. WE THEREFORE HAD NO AC PWR OR COM CAPABILITY ON THE ACFT. WHEN THE CAPT RETURNED I EXPLAINED WHAT HAD HAPPENED AND WE RECHKED THE QRH PROC TO INSURE COMPLIANCE. THE CAPT THEN WENT TO OPS TO CONTACT MAINT CTL WHILE I TRIED TO ARRANGE FOR A PORTABLE GPU. THE CAPT RETURNED AND INDICATED THAT MAINT WAS GOING TO DEFER THE INDICATING SYS. I TOLD THE CAPT THAT I WAS NOT CONVINCED IT WAS THE INDICATING SYS OR THAT WE WERE MEL'ING THE CORRECT PROB. HE RETURNED TO OPS AS WE STILL HAD NO PWR ON THE ACFT, AND RETURNED LATER. HE SAID MAINT WAS AWARE OF THE PROB AND THAT WE WOULD RETURN TO LAX WITHOUT USING THE L PACK OR APU TO PRECLUDE ANY FURTHER PROB. I SUGGESTED THAT THOSE ITEMS WOULD ALSO HAVE TO BE MEL'ED AND HE RESPONDED THAT THEY DID NOT AND THAT THE MEL WE WERE USING WAS CORRECT. WE RECEIVED AN AMENDED RELEASE WITH THE MEL AND A NEW FLT PLAN FOR FL240 FOR THE SINGLE PACK OP. AS WE WERE NOT USING ANY BLEED AIR FROM THE AFFECTED SIDE I WAS CONVINCED THAT THE CONFIGN WAS SAFE AND COMPLIED WITH THE CAPT'S INSTRUCTIONS.
Data retrieved from NASA's ASRS site as of July 2007 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.