Dispatcher detected minimum equipment list discrepancy before flight and cancelled flight.

Attributes
ACN	180407
Time
Date	199106
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	other personnel
Qualification	other other : other
ASRS Report	180407
Events
Anomaly	aircraft equipment problem : less severe non adherence : far
Independent Detector	other other : unspecified
Resolutory Action	other other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On gate in ord with MEL cvr out, maintenance issued second MEL #1 auxiliary pitot heat. Release amended to show second MEL. Second MEL is not legal with first MEL because second MEL restr flight recorder. Flight recorder. Cannot be restr with cvr out. This was caught before flight left the gate and flight was cancelled.

Original NASA ASRS Text

Title: DISPATCHER DETECTED MINIMUM EQUIPMENT LIST DISCREPANCY BEFORE FLT AND CANCELLED FLT.

Narrative: ON GATE IN ORD WITH MEL CVR OUT, MAINT ISSUED SECOND MEL #1 AUX PITOT HEAT. RELEASE AMENDED TO SHOW SECOND MEL. SECOND MEL IS NOT LEGAL WITH FIRST MEL BECAUSE SECOND MEL RESTR FLT RECORDER. FLT RECORDER. CANNOT BE RESTR WITH CVR OUT. THIS WAS CAUGHT BEFORE FLT LEFT THE GATE AND FLT WAS CANCELLED.

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.