LJ25 flight crew execute a missed approach to 14000 ft after a loss of navigation equipment while on approach to pakt descending through 6800 ft.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	603099
Time
Date	200312
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ktn.airport
State Reference	AK
Altitude	msl bound lower : 6800 msl bound upper : 14000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zan.artcc
Operator	general aviation : corporate
Make Model Name	Learjet 25
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 11 other vortac
Flight Phase	descent : approach landing : missed approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 60 flight time total : 15000 flight time type : 1000
ASRS Report	603099
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical altitude deviation : crossing restriction not met altitude deviation : overshoot inflight encounter : weather non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	flight crew : executed missed approach flight crew : exited adverse environment flight crew : overcame equipment problem flight crew : took precautionary avoidance action
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Weather Flight Crew Human Performance Aircraft Airport
Primary Problem	Aircraft

Narrative:

During approach at localizer intercept, we had no localizer and VOR DME. Information was suddenly lost on the arc leaving us no navigation information with rising terrain in front of us with unknown ht and total momentary loss of navigation. Missed approach procedure is to maintain 5000 ft -- which was below us. Not knowing how high the terrain was in our immediate area, we immediately climbed to 14000 ft, the altitude we knew where the tops of clouds were and informed center of our action. Callback conversation with reporter revealed the following information: reporter advised that the equipment problem was attributed to a failed GPS selector switch. The reporter stated that he was more concerned with the local terrain as his reason to 'climb on top' as an evasive action procedure than complying with the published map. Reporter advised that zan had no reported air traffic in the local area having called to report the nature of the incident. Reporter stated that there were no passenger on board.

Original NASA ASRS Text

Title: LJ25 FLT CREW EXECUTE A MISSED APCH TO 14000 FT AFTER A LOSS OF NAV EQUIP WHILE ON APCH TO PAKT DSNDING THROUGH 6800 FT.

Narrative: DURING APCH AT LOC INTERCEPT, WE HAD NO LOC AND VOR DME. INFO WAS SUDDENLY LOST ON THE ARC LEAVING US NO NAV INFO WITH RISING TERRAIN IN FRONT OF US WITH UNKNOWN HT AND TOTAL MOMENTARY LOSS OF NAV. MISSED APCH PROC IS TO MAINTAIN 5000 FT -- WHICH WAS BELOW US. NOT KNOWING HOW HIGH THE TERRAIN WAS IN OUR IMMEDIATE AREA, WE IMMEDIATELY CLBED TO 14000 FT, THE ALT WE KNEW WHERE THE TOPS OF CLOUDS WERE AND INFORMED CTR OF OUR ACTION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED THAT THE EQUIP PROB WAS ATTRIBUTED TO A FAILED GPS SELECTOR SWITCH. THE RPTR STATED THAT HE WAS MORE CONCERNED WITH THE LCL TERRAIN AS HIS REASON TO 'CLB ON TOP' AS AN EVASIVE ACTION PROC THAN COMPLYING WITH THE PUBLISHED MAP. RPTR ADVISED THAT ZAN HAD NO RPTED AIR TFC IN THE LCL AREA HAVING CALLED TO RPT THE NATURE OF THE INCIDENT. RPTR STATED THAT THERE WERE NO PAX ON BOARD.

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.