An EMB145 was dispatched with 2 deferred items on the FMS's. 1 deferred item said 1 operational FMS ...

Attributes
ACN	701357
Time
Date	200606
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	701357
Person 2
Affiliation	company : air carrier
Function	other personnel
Qualification	other
ASRS Report	701360
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 other other : 2
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : manuals contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Flight Crew Human Performance Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

Captain and first officer reviewed aircraft maintenance log in ZZZ during preflight. Read write-ups for FMS #2 and FMS #1. MEL 34-45 for FMS #2 was initiated jun/sun/06 (expires jun/wed/06) stated that one FMS must be operational. MEL 34-46 for FMS #1 was initiated jun/fri/06 (during a previous flight and expires jul/mon/06) stated that both FMS's could be non operational. During preflight; crew assumed MEL 34-46 was the governing MEL and accepted the aircraft. Upon arrival ZZZ1 and after conferring with maintenance control and ZZZ chief pilots; it was determined that MEL 34-45 was not properly cleared. Maintenance control contacted ZZZ1 contract maintenance to clear MEL 34-45 and add FMS #2 to MEL 34-46.

Original NASA ASRS Text

Title: AN EMB145 WAS DISPATCHED WITH 2 DEFERRED ITEMS ON THE FMS'S. 1 DEFERRED ITEM SAID 1 OPERATIONAL FMS WAS REQUIRED.

Narrative: CAPT AND FO REVIEWED ACFT MAINT LOG IN ZZZ DURING PREFLT. READ WRITE-UPS FOR FMS #2 AND FMS #1. MEL 34-45 FOR FMS #2 WAS INITIATED JUN/SUN/06 (EXPIRES JUN/WED/06) STATED THAT ONE FMS MUST BE OPERATIONAL. MEL 34-46 FOR FMS #1 WAS INITIATED JUN/FRI/06 (DURING A PREVIOUS FLT AND EXPIRES JUL/MON/06) STATED THAT BOTH FMS'S COULD BE NON OPERATIONAL. DURING PREFLT; CREW ASSUMED MEL 34-46 WAS THE GOVERNING MEL AND ACCEPTED THE ACFT. UPON ARR ZZZ1 AND AFTER CONFERRING WITH MAINT CTL AND ZZZ CHIEF PLTS; IT WAS DETERMINED THAT MEL 34-45 WAS NOT PROPERLY CLRED. MAINT CTL CONTACTED ZZZ1 CONTRACT MAINT TO CLR MEL 34-45 AND ADD FMS #2 TO MEL 34-46.

Data retrieved from NASA's ASRS site as of January 2009 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.

An EMB145 was dispatched with 2 deferred items on the FMS's. 1 deferred item said 1 operational FMS was required.