<< >> NASA ASRS Report 340502, June 1996

Light transport flight crew misses crossing restr due to attention given to GPS malfunction and resulting navigation error.

Attributes
ACN	340502
Time
Date	199606
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : phk
State Reference	FL
Altitude	msl bound lower : 10000 msl bound upper : 14000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zma
Operator	general aviation : corporate
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time total : 8350
ASRS Report	340502
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

While on the arrival to land at bct, I was given a crossing restr of 10000 ft at ulman intersection phk 315 degrees/15 KTS. After planning my descent to cross ulman at 10000 ft using the global navigation, I began my descent. While in the descent I started receiving bad wind information from the global navigation. As I continued we crosschecked with the VOR and DME and found the global navigation about 8 or 10 mi off. By that time I was unable to make my restr, as the center controller informed me of not making my crossing. While having the VOR on the copilot side set up for the arrival and xchking, time did not permit correcting the situation. To prevent this happening in the future, monitor and use all resources available in the cockpit. Don't get used to relying on one system. Also any help from the controller as he sees fit to ask or inform if the restrs are going to be met, and advise accordingly.

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Original NASA ASRS Text

Title: LTT FLC MISSES XING RESTR DUE TO ATTN GIVEN TO GPS MALFUNCTION AND RESULTING NAV ERROR.

Narrative: WHILE ON THE ARR TO LAND AT BCT, I WAS GIVEN A XING RESTR OF 10000 FT AT ULMAN INTXN PHK 315 DEGS/15 KTS. AFTER PLANNING MY DSCNT TO CROSS ULMAN AT 10000 FT USING THE GLOBAL NAV, I BEGAN MY DSCNT. WHILE IN THE DSCNT I STARTED RECEIVING BAD WIND INFO FROM THE GLOBAL NAV. AS I CONTINUED WE XCHKED WITH THE VOR AND DME AND FOUND THE GLOBAL NAV ABOUT 8 OR 10 MI OFF. BY THAT TIME I WAS UNABLE TO MAKE MY RESTR, AS THE CTR CTLR INFORMED ME OF NOT MAKING MY XING. WHILE HAVING THE VOR ON THE COPLT SIDE SET UP FOR THE ARR AND XCHKING, TIME DID NOT PERMIT CORRECTING THE SIT. TO PREVENT THIS HAPPENING IN THE FUTURE, MONITOR AND USE ALL RESOURCES AVAILABLE IN THE COCKPIT. DON'T GET USED TO RELYING ON ONE SYS. ALSO ANY HELP FROM THE CTLR AS HE SEES FIT TO ASK OR INFORM IF THE RESTRS ARE GOING TO BE MET, AND ADVISE ACCORDINGLY.

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.