A CE510 departed a high altitude airport but was unable to get GPS or VOR navigation guidance for th...

Attributes
ACN	949357
Time
Date	201105
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Make Model Name	Cessna Citation Mustang (C510)
Operating Under FAR Part	Part 135
Flight Phase	Initial Climb
Route In Use	SID ZZZ
Flight Plan	IFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 90 Flight Crew Total 9500 Flight Crew Type 10
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 3700 Flight Crew Type 10
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural FAR

Narrative:

We were cleared for the departure; climbed to 9;000 ft; and contacted departure. We programmed the departure into our flight plan with the first and second waypoints. After departing; the GPS essentially locked up and was not showing us track or course information. The course selector would not move out of the GPS mode thereby not allowing us to get navigation data from the VOR either. We had visual contact with the terrain and maneuvered to remain clear of the terrain. Because we had no reliable navigation source we requested an immediate climb to a higher altitude. We were denied; but elected to climb to the MEA in that area. We advised the controller we were climbing to 14;000 ft for terrain avoidance. Because we weren't sure of our position we elected to climb to a safe altitude to sort the problem out. We did not state to departure that we had no functioning navigation equipment. After reaching 14;000 ft we leveled and were picked up on radar and given vectors. After repeatedly working with the navigation equipment we finally got it to work and continued on with no further difficulties. We submitted an MEL form to our maintenance people alerting them to the problem.

Original NASA ASRS Text

Title: A CE510 departed a high altitude airport but was unable to get GPS or VOR navigation guidance for the SID; so climbed to MEA of 14;000 FT after ATC refused a similar request. The crew did not inform ATC of the navigation difficulties before the systems returned to normal.

Narrative: We were cleared for the departure; climbed to 9;000 FT; and contacted Departure. We programmed the departure into our flight plan with the first and second waypoints. After departing; the GPS essentially locked up and was not showing us track or course information. The course selector would not move out of the GPS mode thereby not allowing us to get navigation data from the VOR either. We had visual contact with the terrain and maneuvered to remain clear of the terrain. Because we had no reliable navigation source we requested an immediate climb to a higher altitude. We were denied; but elected to climb to the MEA in that area. We advised the Controller we were climbing to 14;000 FT for terrain avoidance. Because we weren't sure of our position we elected to climb to a safe altitude to sort the problem out. We did not state to Departure that we had no functioning navigation equipment. After reaching 14;000 FT we leveled and were picked up on radar and given vectors. After repeatedly working with the navigation equipment we finally got it to work and continued on with no further difficulties. We submitted an MEL form to our Maintenance people alerting them to the problem.

Data retrieved from NASA's ASRS site as of April 2012 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.

A CE510 departed a high altitude airport but was unable to get GPS or VOR navigation guidance for the SID; so climbed to MEA of 14;000 ft after ATC refused a similar request. The crew did not inform ATC of the navigation difficulties before the systems returned to normal.