Dash8 flight crew is dispatched with with two pressurization deferrals which are not allowed to coex...

Attributes
ACN	857081
Time
Date	200910
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Dash 8-100
Operating Under FAR Part	Part 121
Flight Phase	Parked Taxi
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	First Officer Pilot Not Flying
Experience	Flight Crew Last 90 Days 255 Flight Crew Total 2000 Flight Crew Type 255
Person 2
Function	Captain Pilot Flying
Experience	Flight Crew Last 90 Days 180 Flight Crew Total 20000 Flight Crew Type 1000
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural MEL Deviation - Procedural Published Material / Policy

Narrative:

The flight crew completed one flight segment and swapped into a different aircraft. During the preflight both pilots reviewed the aircraft logbook which contained an active MEL (21-1-3). The captain looked up the MEL and asked the first officer to reference the appropriate appendix per the MEL. The first officer then accidentally referenced the wrong appendix number and the aircraft was deemed airworthy. During the takeoff briefing the pilots reviewed the operation of the pressurization system and realized they may have referenced the wrong appendix. After taxiing to a safe spot the parking brake was set and the flightcrew reviewed both the MEL and the appropriate appendix. It was then realized that the aircraft was not airworthy. The captain then called dispatch/maintenance to review the problem and the aircraft was taxied back to the back. The passengers were de-boarded and the flightcrew swapped into a new aircraft and successfully completed the flight both maintenance and flight crews should devote more time and attention to the assignment of mels. During an aircraft swap the flight crew needs to perform a thorough preflight inspection and query maintenance if there are questions.

Original NASA ASRS Text

Title: Dash8 Flight Crew is dispatched with with two pressurization deferrals which are not allowed to coexist by the MEL. Discrepancy is discovered during taxi to runway and flight returns to gate.

Narrative: The flight Crew completed one flight segment and swapped into a different aircraft. During the preflight both pilots reviewed the aircraft logbook which contained an active MEL (21-1-3). The captain looked up the MEL and asked the FO to reference the appropriate appendix per the MEL. The FO then accidentally referenced the wrong appendix number and the aircraft was deemed airworthy. During the takeoff briefing the pilots reviewed the operation of the pressurization system and realized they may have referenced the wrong appendix. After taxiing to a safe spot the parking brake was set and the flightcrew reviewed both the MEL and the appropriate appendix. It was then realized that the aircraft was not airworthy. The captain then called dispatch/maintenance to review the problem and the aircraft was taxied back to the back. The passengers were de-boarded and the flightcrew swapped into a new aircraft and successfully completed the flight Both maintenance and flight crews should devote more time and attention to the assignment of MELs. During an aircraft swap the Flight Crew needs to perform a thorough preflight inspection and query maintenance if there are questions.

Data retrieved from NASA's ASRS site as of April 2012 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.

Dash8 flight crew is dispatched with with two pressurization deferrals which are not allowed to coexist by the MEL. Discrepancy is discovered during taxi to runway and flight returns to gate.