Altitude heading track deviation.

Attributes
ACN	265484
Time
Date	199403
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : sei
State Reference	NJ
Altitude	msl bound lower : 13600 msl bound upper : 14000
Environment
Flight Conditions	Marginal
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other other
Route In Use	enroute airway : 308
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 180 flight time total : 4000 flight time type : 2000
ASRS Report	265484
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 13000 flight time type : 900
ASRS Report	265700
Events
Anomaly	aircraft equipment problem : critical altitude deviation : overshoot non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Passenger flight from bdr to dca. At approximately 17000 ft MSL we both heard a loud bang and noticed what looked like a cracked side windshield. Following our company checklist we requested 14000 ft while determining the extent of the problem. Autoplt was on and altitude was selected. We both heard the 1000 ft to go warning for autoplt altitude capture. While looking at the windshield we determined that a seal had come loose and then noticed we had descended through 14000 ft to 13600 ft. Immediately corrected back to 14000 ft. Also, the northeast corridor chart we were using showed V308 off waterloo (ATR) VOR as the 275 degree radial. The 7 of 275 is on the crease of the map and consequently looked like a '1' to me so we tracked out on the 215 degree radial. ATC pointed out our mistrack and we connected but got approximately 7 mi off the correct airway.

Original NASA ASRS Text

Title: ALT HDG TRACK DEV.

Narrative: PAX FLT FROM BDR TO DCA. AT APPROX 17000 FT MSL WE BOTH HEARD A LOUD BANG AND NOTICED WHAT LOOKED LIKE A CRACKED SIDE WINDSHIELD. FOLLOWING OUR COMPANY CHKLIST WE REQUESTED 14000 FT WHILE DETERMINING THE EXTENT OF THE PROB. AUTOPLT WAS ON AND ALT WAS SELECTED. WE BOTH HEARD THE 1000 FT TO GO WARNING FOR AUTOPLT ALT CAPTURE. WHILE LOOKING AT THE WINDSHIELD WE DETERMINED THAT A SEAL HAD COME LOOSE AND THEN NOTICED WE HAD DSNDED THROUGH 14000 FT TO 13600 FT. IMMEDIATELY CORRECTED BACK TO 14000 FT. ALSO, THE NE CORRIDOR CHART WE WERE USING SHOWED V308 OFF WATERLOO (ATR) VOR AS THE 275 DEG RADIAL. THE 7 OF 275 IS ON THE CREASE OF THE MAP AND CONSEQUENTLY LOOKED LIKE A '1' TO ME SO WE TRACKED OUT ON THE 215 DEG RADIAL. ATC POINTED OUT OUR MISTRACK AND WE CONNECTED BUT GOT APPROX 7 MI OFF THE CORRECT AIRWAY.

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.