<< >> NASA ASRS Report 399860, April 1998

A falcon 50 flight crew overshot their altitude in descent when the autoplt is disconnected for an out of trim condition and then reconnected, without verifying that the altitude preselect is armed.

Attributes
ACN	399860
Time
Date	199804
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : hpn
State Reference	NY
Altitude	msl bound lower : 1700 msl bound upper : 2000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90
Operator	general aviation : corporate
Make Model Name	Falcon 50
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 50 flight time total : 14000 flight time type : 500
ASRS Report	399860
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot inflight encounter : weather non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Cleared to descend from 3000 ft to 2000 ft on vectors for ILS approach with autoplt engaged, mistrim announced/illuminated on failure warning panel. Autoplt was disengaged, aircraft retrimmed and autoplt re-engaged and fault was cleared. But altitude preselect did not reset and assigned altitude was overshot by 300 ft and immediately corrected. Failure to verify that all flight director functions were set properly due to WX distraction contributed to this altitude deviation. Moderate turbulence and moderate rain occurring at the time.

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Original NASA ASRS Text

Title: A FALCON 50 FLC OVERSHOT THEIR ALT IN DSCNT WHEN THE AUTOPLT IS DISCONNECTED FOR AN OUT OF TRIM CONDITION AND THEN RECONNECTED, WITHOUT VERIFYING THAT THE ALT PRESELECT IS ARMED.

Narrative: CLRED TO DSND FROM 3000 FT TO 2000 FT ON VECTORS FOR ILS APCH WITH AUTOPLT ENGAGED, MISTRIM ANNOUNCED/ILLUMINATED ON FAILURE WARNING PANEL. AUTOPLT WAS DISENGAGED, ACFT RETRIMMED AND AUTOPLT RE-ENGAGED AND FAULT WAS CLRED. BUT ALT PRESELECT DID NOT RESET AND ASSIGNED ALT WAS OVERSHOT BY 300 FT AND IMMEDIATELY CORRECTED. FAILURE TO VERIFY THAT ALL FLT DIRECTOR FUNCTIONS WERE SET PROPERLY DUE TO WX DISTR CONTRIBUTED TO THIS ALTDEV. MODERATE TURB AND MODERATE RAIN OCCURRING AT THE TIME.

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.