<< >> NASA ASRS Report 793480, July 2008

An A319 had intermittent GPS failure indications after takeoff and became unusable for the arrival. All navigation displays were blank requiring raw data flight.

Attributes
ACN	793480
Time
Date	200807
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 20000
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival star : n/s
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	793480
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 20 flight time total : 6900 flight time type : 20
ASRS Report	793485
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : returned to intended or assigned course flight crew : overcame equipment problem
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

We had intermittent GPS failure indications. On the arrival into ZZZ; ATC called and directed a turn to 330 degrees to join the arrival. All indications on the navigation display were blank with a GPS offline indication. Flight director were on course. Notified ATC of navigation failure and flew a visual approach to runway xxl with raw data backup with no other incident. Supplemental information from acn 793485: during descent joining the arrival; we experienced a GPS failure. The failure occurred as we were in a turn to an assigned heading of 330 degrees to join the arrival. The aircraft map displays were lost and for a time we overflew the assigned course. While we were pulling up raw data navigation; ATC queried our heading and assigned us a new one. We reported our navigation failure and continued into the airport. We landed visually with raw data backup and the remainder of the flight was uneventful.

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Original NASA ASRS Text

Title: AN A319 HAD INTERMITTENT GPS FAILURE INDICATIONS AFTER TKOF AND BECAME UNUSABLE FOR THE ARRIVAL. ALL NAV DISPLAYS WERE BLANK REQUIRING RAW DATA FLT.

Narrative: WE HAD INTERMITTENT GPS FAILURE INDICATIONS. ON THE ARR INTO ZZZ; ATC CALLED AND DIRECTED A TURN TO 330 DEGS TO JOIN THE ARR. ALL INDICATIONS ON THE NAV DISPLAY WERE BLANK WITH A GPS OFFLINE INDICATION. FLT DIRECTOR WERE ON COURSE. NOTIFIED ATC OF NAV FAILURE AND FLEW A VISUAL APCH TO RWY XXL WITH RAW DATA BACKUP WITH NO OTHER INCIDENT. SUPPLEMENTAL INFO FROM ACN 793485: DURING DSCNT JOINING THE ARR; WE EXPERIENCED A GPS FAILURE. THE FAILURE OCCURRED AS WE WERE IN A TURN TO AN ASSIGNED HDG OF 330 DEGS TO JOIN THE ARR. THE ACFT MAP DISPLAYS WERE LOST AND FOR A TIME WE OVERFLEW THE ASSIGNED COURSE. WHILE WE WERE PULLING UP RAW DATA NAV; ATC QUERIED OUR HDG AND ASSIGNED US A NEW ONE. WE RPTED OUR NAV FAILURE AND CONTINUED INTO THE ARPT. WE LANDED VISUALLY WITH RAW DATA BACKUP AND THE REMAINDER OF THE FLT WAS UNEVENTFUL.

Data retrieved from NASA's ASRS site as of May 2009 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.