A wbd transport overwater flight was canceled due to a leaking brake deferred per the MEL. Aircraft ...

Attributes
ACN	599979
Time
Date	200311
Day	Sun
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Plan	IFR
Aircraft 2
Flight Phase	ground : parked
Person 1
Affiliation	company : air carrier
Function	other personnel
Qualification	other
ASRS Report	599979
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : far non adherence : published procedure
Independent Detector	other flight crewa other flight crewb
Resolutory Action	other
Consequence	other other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : repair
Supplementary
Problem Areas	Flight Crew Human Performance Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Chart Or Publication

Narrative:

Flight ZZZ-ZZZZ was already delayed due to late inbound equipment. A hydraulic leak in one of the brakes was discovered upon arrival. Technician services contacted me for approval to use MEL 32-20B wheel brakes deactivated by capping the line (1 brake inoperative). They were unable to use 32-20A due to the leakage. I approved and placarded based on the weight reduction table in the MEL manual for 32-20B. I then turned computer listing limits on which applied a penalty of 160000 pounds to both the runway limited and climb limited takeoff weight. I contacted operations engineering and they said that the 160000 pounds is correct due to having to leave the gear down for 2 mins after takeoff. The MEL does refer to 'OM volume #1, performance non-normals-gear down operations' where the correct weight reductions are found. I called technician back and told them that I would have to deny the placard due to the weight limitation! The aircraft was removed from service and the flight subsequently cancelled. The weight reduction table in the MEL manual needs to accurately reflect the restrs on the operating manual.

Original NASA ASRS Text

Title: A WBD TRANSPORT OVERWATER FLT WAS CANCELED DUE TO A LEAKING BRAKE DEFERRED PER THE MEL. ACFT COULD NOT MEET OPERATING RESTRS IN MANUAL.

Narrative: FLT ZZZ-ZZZZ WAS ALREADY DELAYED DUE TO LATE INBOUND EQUIP. A HYD LEAK IN ONE OF THE BRAKES WAS DISCOVERED UPON ARR. TECHNICIAN SVCS CONTACTED ME FOR APPROVAL TO USE MEL 32-20B WHEEL BRAKES DEACTIVATED BY CAPPING THE LINE (1 BRAKE INOP). THEY WERE UNABLE TO USE 32-20A DUE TO THE LEAKAGE. I APPROVED AND PLACARDED BASED ON THE WT REDUCTION TABLE IN THE MEL MANUAL FOR 32-20B. I THEN TURNED COMPUTER LISTING LIMITS ON WHICH APPLIED A PENALTY OF 160000 LBS TO BOTH THE RWY LIMITED AND CLB LIMITED TKOF WT. I CONTACTED OPS ENGINEERING AND THEY SAID THAT THE 160000 LBS IS CORRECT DUE TO HAVING TO LEAVE THE GEAR DOWN FOR 2 MINS AFTER TKOF. THE MEL DOES REFER TO 'OM VOLUME #1, PERFORMANCE NON-NORMALS-GEAR DOWN OPS' WHERE THE CORRECT WT REDUCTIONS ARE FOUND. I CALLED TECHNICIAN BACK AND TOLD THEM THAT I WOULD HAVE TO DENY THE PLACARD DUE TO THE WT LIMITATION! THE ACFT WAS REMOVED FROM SVC AND THE FLT SUBSEQUENTLY CANCELLED. THE WT REDUCTION TABLE IN THE MEL MANUAL NEEDS TO ACCURATELY REFLECT THE RESTRS ON THE OPERATING MANUAL.

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.

A wbd transport overwater flight was canceled due to a leaking brake deferred per the MEL. Aircraft could not meet operating restrs in manual.