|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||airport : dtw|
|Altitude||agl bound lower : 0|
agl bound upper : 0
|Controlling Facilities||tower : jfk|
|Operator||common carrier : air carrier|
|Make Model Name||Large Transport, Low Wing, 3 Turbojet Eng|
|Flight Phase||ground : preflight|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : flight engineer|
pilot : commercial
pilot : atp
pilot : instrument
|Experience||flight time last 90 days : 130|
flight time total : 11800
flight time type : 6100
|Anomaly||aircraft equipment problem : less severe|
non adherence : published procedure
|Independent Detector||other flight crewa|
|Resolutory Action||none taken : anomaly accepted|
|Air Traffic Incident||other|
This problem arose because of an inaccurate MEL. We were scheduled to fly an large transport from dtw to mia, and while reviewing the aircraft logbook, noticed a deferred item that required additional research. That deferred item was an inoperative auxiliary vertical gyro. We checked the MEL in the large transport manual and found that it indicated, erroneously, that 2 gyros are installed and required for flight. The fact is that 3 gyros are installed, captain's, first officer's and the auxiliary. We contacted our dispatcher and maintenance control and were assured that all that was required were 2 gyros with separate power sources, which we had. The WX was good during all regimes of flight and we elected to accept the aircraft. According to our MEL, if no mention is made of a component, it is a required, no-go item. Obviously in this case, the MEL is in error by showing the installation of only 2 gyros, when in fact 3 are installed, each with separate power sources. In our judgement, the MEL is in error. No danger to the flight existed and the flight could and should have been continued. Our FAA approved, company written MEL should be corrected. Also, on the following day, flight from tpa to mem, different ship, the exact situation recurred.
Original NASA ASRS Text
Title: MINIMUM EQUIPMENT LIST IN ERROR.
Narrative: THIS PROB AROSE BECAUSE OF AN INACCURATE MEL. WE WERE SCHEDULED TO FLY AN LGT FROM DTW TO MIA, AND WHILE REVIEWING THE ACFT LOGBOOK, NOTICED A DEFERRED ITEM THAT REQUIRED ADDITIONAL RESEARCH. THAT DEFERRED ITEM WAS AN INOP AUX VERT GYRO. WE CHKED THE MEL IN THE LGT MANUAL AND FOUND THAT IT INDICATED, ERRONEOUSLY, THAT 2 GYROS ARE INSTALLED AND REQUIRED FOR FLT. THE FACT IS THAT 3 GYROS ARE INSTALLED, CAPT'S, FO'S AND THE AUX. WE CONTACTED OUR DISPATCHER AND MAINT CTL AND WERE ASSURED THAT ALL THAT WAS REQUIRED WERE 2 GYROS WITH SEPARATE PWR SOURCES, WHICH WE HAD. THE WX WAS GOOD DURING ALL REGIMES OF FLT AND WE ELECTED TO ACCEPT THE ACFT. ACCORDING TO OUR MEL, IF NO MENTION IS MADE OF A COMPONENT, IT IS A REQUIRED, NO-GO ITEM. OBVIOUSLY IN THIS CASE, THE MEL IS IN ERROR BY SHOWING THE INSTALLATION OF ONLY 2 GYROS, WHEN IN FACT 3 ARE INSTALLED, EACH WITH SEPARATE PWR SOURCES. IN OUR JUDGEMENT, THE MEL IS IN ERROR. NO DANGER TO THE FLT EXISTED AND THE FLT COULD AND SHOULD HAVE BEEN CONTINUED. OUR FAA APPROVED, COMPANY WRITTEN MEL SHOULD BE CORRECTED. ALSO, ON THE FOLLOWING DAY, FLT FROM TPA TO MEM, DIFFERENT SHIP, THE EXACT SITUATION RECURRED.
Data retrieved from NASA's ASRS site as of August 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.