<< >> NASA ASRS Report 279841, August 1994

Altitude deviation

Attributes
ACN	279841
Time
Date	199408
Day	Sat
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : yvr
State Reference	BC
Altitude	msl bound lower : 40500 msl bound upper : 41000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : cyvr tower : ord
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 20000 flight time type : 2000
ASRS Report	279841
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : far other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flight was in cruise at FL410 in clear skies at M79, autothrottles on, autoplt engaged, thrust set in maximum continued mode, V navigation and left navigation engaged. Captain went to 'blueroom.' when captain returned to cockpit aircraft was nose high and airspeed was deteriorating below 180 KTS. Thrust was now in cruise mode. Captain immediately disconnected autothrottles, selected maximum continuous power and told first officer to initiate descent to increase airspeed. Captain called ATC passing 40500 ft to inform them of actions and get clearance to lower altitude (FL350). Airspeed increased to normal. All systems and engine operations were normal. The aircraft responded normally with no abnormalities noted. Remainder of flight was normal in all respects. Problem became apparent due to aircraft buffet. Inattn to aircraft was probable leading cause. First officer was not overly pleased by having to work for any captain.

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Original NASA ASRS Text

Title: ALTDEV

Narrative: FLT WAS IN CRUISE AT FL410 IN CLR SKIES AT M79, AUTOTHROTTLES ON, AUTOPLT ENGAGED, THRUST SET IN MAXIMUM CONTINUED MODE, V NAV AND L NAV ENGAGED. CAPT WENT TO 'BLUEROOM.' WHEN CAPT RETURNED TO COCKPIT ACFT WAS NOSE HIGH AND AIRSPD WAS DETERIORATING BELOW 180 KTS. THRUST WAS NOW IN CRUISE MODE. CAPT IMMEDIATELY DISCONNECTED AUTOTHROTTLES, SELECTED MAXIMUM CONTINUOUS PWR AND TOLD FO TO INITIATE DSCNT TO INCREASE AIRSPD. CAPT CALLED ATC PASSING 40500 FT TO INFORM THEM OF ACTIONS AND GET CLRNC TO LOWER ALT (FL350). AIRSPD INCREASED TO NORMAL. ALL SYSTEMS AND ENG OPS WERE NORMAL. THE ACFT RESPONDED NORMALLY WITH NO ABNORMALITIES NOTED. REMAINDER OF FLT WAS NORMAL IN ALL RESPECTS. PROB BECAME APPARENT DUE TO ACFT BUFFET. INATTN TO ACFT WAS PROBABLE LEADING CAUSE. FO WAS NOT OVERLY PLEASED BY HAVING TO WORK FOR ANY CAPT.

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.