A large air carrier aircraft delayed departure beyond local curfew because of a mechanical.

Attributes
ACN	771951
Time
Date	200801
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 60 flight time total : 9500 flight time type : 6000
ASRS Report	771951
Events
Anomaly	non adherence : far non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft Company
Primary Problem	Company

Narrative:

Experiencing a mechanical delay at ZZZ. Company commercial chart shows local curfew with a last depart time. Contact made with company dispatch to get information for departure. Dispatcher contacts ZZZ tower and is told since the reason is 'mechanical' we may depart after normal hours. Contact made with tower at XA30 to double-check closure; and we were informed we can depart at any time. We received TRACON land line number from ZZZ tower to receive ATC clearance; as tower personnel report they depart at XA45. We depart using runway xx at XC01 local time. Although we had been assured by ZZZ tower and our dispatcher that departure at this hour was approved; a NOTAM appeared in our flight release papers indicating that we had exceeded the noise decibel limit for that time period.

Original NASA ASRS Text

Title: A LARGE ACR ACFT DELAYED DEP BEYOND LCL CURFEW BECAUSE OF A MECHANICAL.

Narrative: EXPERIENCING A MECHANICAL DELAY AT ZZZ. COMPANY COMMERCIAL CHART SHOWS LCL CURFEW WITH A LAST DEPART TIME. CONTACT MADE WITH COMPANY DISPATCH TO GET INFO FOR DEP. DISPATCHER CONTACTS ZZZ TWR AND IS TOLD SINCE THE REASON IS 'MECHANICAL' WE MAY DEPART AFTER NORMAL HRS. CONTACT MADE WITH TWR AT XA30 TO DOUBLE-CHK CLOSURE; AND WE WERE INFORMED WE CAN DEPART AT ANY TIME. WE RECEIVED TRACON LAND LINE NUMBER FROM ZZZ TWR TO RECEIVE ATC CLRNC; AS TWR PERSONNEL RPT THEY DEPART AT XA45. WE DEPART USING RWY XX AT XC01 LCL TIME. ALTHOUGH WE HAD BEEN ASSURED BY ZZZ TWR AND OUR DISPATCHER THAT DEP AT THIS HR WAS APPROVED; A NOTAM APPEARED IN OUR FLT RELEASE PAPERS INDICATING THAT WE HAD EXCEEDED THE NOISE DECIBEL LIMIT FOR THAT TIME PERIOD.

Data retrieved from NASA's ASRS site as of May 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.