Altitude deviation by flight crew of mdt.

Attributes
ACN	196064
Time
Date	199112
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : baf
State Reference	MA
Altitude	msl bound lower : 14000 msl bound upper : 14500
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sea
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute airway : v292
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 240 flight time total : 11700 flight time type : 240
ASRS Report	196064
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

I was the captain on flight from bos to abe. Copilot was flying. I was calling a writeup in to company maintenance when I felt the aircraft pitch up. (We were at 14000 ft MSL with the autoplt engaged in heading and altitude hold modes.) when I looked at the altimeter it read +/-14400 ft MSL. (The climb was abrupt and rapid.) the copilot disengaged the autoplt and descended to 14000 ft MSL. Just as we leveled at 14000 ft ATC called and asked our altitude. We gave it truthfully at 14000 ft. ATC advised that he had shown us at 14500. We stopped using the autoplt and wrote it up as per company operations.

Original NASA ASRS Text

Title: ALTDEV BY FLC OF MDT.

Narrative: I WAS THE CAPT ON FLT FROM BOS TO ABE. COPLT WAS FLYING. I WAS CALLING A WRITEUP IN TO COMPANY MAINT WHEN I FELT THE ACFT PITCH UP. (WE WERE AT 14000 FT MSL WITH THE AUTOPLT ENGAGED IN HDG AND ALT HOLD MODES.) WHEN I LOOKED AT THE ALTIMETER IT READ +/-14400 FT MSL. (THE CLB WAS ABRUPT AND RAPID.) THE COPLT DISENGAGED THE AUTOPLT AND DSNDED TO 14000 FT MSL. JUST AS WE LEVELED AT 14000 FT ATC CALLED AND ASKED OUR ALT. WE GAVE IT TRUTHFULLY AT 14000 FT. ATC ADVISED THAT HE HAD SHOWN US AT 14500. WE STOPPED USING THE AUTOPLT AND WROTE IT UP AS PER COMPANY OPS.

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.