<< >> NASA ASRS Report 544634, April 2002

An airbus 320 on approach at 5 mi with localizer captured the aircraft went into the go around mode uncommanded and exceeded assigned altitude.

Attributes
ACN	544634
Time
Date	200204
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 2000
Environment
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 8l other
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 172
ASRS Report	544634
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : overrode automation flight crew : executed missed approach
Consequence	other other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

Cleared for the approach ILS runway 8L, autoplt on, slowing to 160 KTS, localizer captured. Approximately 5 mi from FAF, aircraft entered the go around mode with no input from crew. During recovery from go around mode, we exceeded ATC assigned altitude by approximately 800-900 ft. We then asked for a missed approach and landed without incident .320 approach mode was activated and confirmed.

Related reports:

• A B737-700 deviated right of the bur runway 8 ILS localizer ...
• Upon intercepting the lga localizer runway 22 final approach...
• B737-700 flight crew has aircraft perform uncommanded pitch ...

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Original NASA ASRS Text

Title: AN AIRBUS 320 ON APCH AT 5 MI WITH LOC CAPTURED THE ACFT WENT INTO THE GAR MODE UNCOMMANDED AND EXCEEDED ASSIGNED ALT.

Narrative: CLRED FOR THE APCH ILS RWY 8L, AUTOPLT ON, SLOWING TO 160 KTS, LOC CAPTURED. APPROX 5 MI FROM FAF, ACFT ENTERED THE GAR MODE WITH NO INPUT FROM CREW. DURING RECOVERY FROM GAR MODE, WE EXCEEDED ATC ASSIGNED ALT BY APPROX 800-900 FT. WE THEN ASKED FOR A MISSED APCH AND LANDED WITHOUT INCIDENT .320 APCH MODE WAS ACTIVATED AND CONFIRMED.

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.