<< >> NASA ASRS Report 521010, August 2001

Altitude deviation altitude overshot when an lr-31A flight crew is distraction by a failed inverter on descent near ringr intersection, tx.

Attributes
ACN	521010
Time
Date	200108
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	intersection : fingr
State Reference	TX
Altitude	msl bound lower : 12600 msl bound upper : 13000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Learjet 31
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : n/s
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 4700 flight time type : 20
ASRS Report	521010
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance
Resolutory Action	flight crew : became reoriented flight crew : returned to assigned altitude
Supplementary
Problem Areas	Environmental Factor Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While descending to 13000 ft, an inverter failed, creating a situation in which the captain was required to check a lower side panel for circuit breaker while running an abnormal checklist. I took over as PF because in the loss of the inverter, the autoplt failed. During a period of heavy workload and poor cockpit visibility due to glare, a mistake was made in interpreting the altimeter and our altitude of 13000 ft (assigned) was passed by 400 ft. Immediate action was taken to correct the altitude deviation. This situation could have been avoided by our increased attention to the aircraft flight path and crew coordination improvement. Too much attention was given to the electrical problem and not to the aircraft operation. Care should be taken not to let confusion take over the crew's attention. Adding to the situation was a glare in the instrumentation which made it difficult to see and immediately interpret the altimeter.

Related reports:

• Light transport aircraft in descent for crossing restr, flig...
• Flight crew of an S80 fail to make the turn to 010 degrees a...
• A distraction MD83 flight crew fails to make the assigned al...
• A delayed altitude clearance is finally received by the flig...
• Crossing restr a jokur intersection not met due to planning,...
• A descending B737-700 flight crew fails to make their crossi...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT WHEN AN LR-31A FLT CREW IS DISTR BY A FAILED INVERTER ON DSCNT NEAR RINGR INTXN, TX.

Narrative: WHILE DSNDING TO 13000 FT, AN INVERTER FAILED, CREATING A SIT IN WHICH THE CAPT WAS REQUIRED TO CHK A LOWER SIDE PANEL FOR CIRCUIT BREAKER WHILE RUNNING AN ABNORMAL CHKLIST. I TOOK OVER AS PF BECAUSE IN THE LOSS OF THE INVERTER, THE AUTOPLT FAILED. DURING A PERIOD OF HVY WORKLOAD AND POOR COCKPIT VISIBILITY DUE TO GLARE, A MISTAKE WAS MADE IN INTERPRETING THE ALTIMETER AND OUR ALT OF 13000 FT (ASSIGNED) WAS PASSED BY 400 FT. IMMEDIATE ACTION WAS TAKEN TO CORRECT THE ALTDEV. THIS SIT COULD HAVE BEEN AVOIDED BY OUR INCREASED ATTN TO THE ACFT FLT PATH AND CREW COORD IMPROVEMENT. TOO MUCH ATTN WAS GIVEN TO THE ELECTRICAL PROB AND NOT TO THE ACFT OP. CARE SHOULD BE TAKEN NOT TO LET CONFUSION TAKE OVER THE CREW'S ATTN. ADDING TO THE SIT WAS A GLARE IN THE INSTRUMENTATION WHICH MADE IT DIFFICULT TO SEE AND IMMEDIATELY INTERPRET THE ALTIMETER.

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.