A C425 pilot experiences a heading and track deviation and enters a restr area northeast of hec, ca.

Attributes
ACN	574118
Time
Date	200302
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : hec.vortac
State Reference	CA
Altitude	msl single value : 23000
Environment
Flight Conditions	VMC
Weather Elements	Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	general aviation : personal
Make Model Name	Conquest I/Conquest II
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 20 flight time total : 4350 flight time type : 450
ASRS Report	574118
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	aircraft equipment problem : less severe airspace violation : entry maintenance problem : improper maintenance non adherence : clearance non adherence : far other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued alert controller : issued new clearance flight crew : exited penetrated airspace flight crew : returned to original clearance
Consequence	faa : reviewed incident with flight crew other other
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Flight Crew Human Performance
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

I was returning aircraft from fat to ksdl at FL230 in clear air and light turbulence. The aircraft had been at FBO for phase 2 and 3 inspection. At the same time, the avionics shop had installed a used overhauled collins ADI-70C and 332D-11T vertical gyroscope and a new ryan 9900BX tcad. When I departed fat, the gyroscope was working properly. After level off at FL230, gyroscope precessed 6 degrees down pitch and autoplt could not hold level flight for more than 10-15 mins. After about 1 hour's flight over hector VOR (hec) the attitude gyroscope tumbled and, unnoticed by me, the HSI compass precessed about 35 degrees to the left. While trying to solve the problem and fast erect the attitude gyro, the aircraft was in a turn to a heading that took me in the R-2501N restr area. The ZLA controller gave me a heading of 030 degrees to get me out of the restr area. At the time, my heading on the HSI was still at 076 degrees, and I was unaware of the compass precession. When I landed at scottsdale, I called the X avionics shop and made them aware of the failure, and they contacted Y avionics to repair the gyros. I feel that due to the distraction I experienced with the attitude gyro, and trying to correct that problem, it contributed to me being unaware the aircraft was in a slow turn to the south that put the aircraft in the restr area.

Original NASA ASRS Text

Title: A C425 PLT EXPERIENCES A HDG AND TRACK DEV AND ENTERS A RESTR AREA NE OF HEC, CA.

Narrative: I WAS RETURNING ACFT FROM FAT TO KSDL AT FL230 IN CLR AIR AND LIGHT TURB. THE ACFT HAD BEEN AT FBO FOR PHASE 2 AND 3 INSPECTION. AT THE SAME TIME, THE AVIONICS SHOP HAD INSTALLED A USED OVERHAULED COLLINS ADI-70C AND 332D-11T VERT GYROSCOPE AND A NEW RYAN 9900BX TCAD. WHEN I DEPARTED FAT, THE GYROSCOPE WAS WORKING PROPERLY. AFTER LEVEL OFF AT FL230, GYROSCOPE PRECESSED 6 DEGS DOWN PITCH AND AUTOPLT COULD NOT HOLD LEVEL FLT FOR MORE THAN 10-15 MINS. AFTER ABOUT 1 HR'S FLT OVER HECTOR VOR (HEC) THE ATTITUDE GYROSCOPE TUMBLED AND, UNNOTICED BY ME, THE HSI COMPASS PRECESSED ABOUT 35 DEGS TO THE L. WHILE TRYING TO SOLVE THE PROB AND FAST ERECT THE ATTITUDE GYRO, THE ACFT WAS IN A TURN TO A HDG THAT TOOK ME IN THE R-2501N RESTR AREA. THE ZLA CTLR GAVE ME A HDG OF 030 DEGS TO GET ME OUT OF THE RESTR AREA. AT THE TIME, MY HDG ON THE HSI WAS STILL AT 076 DEGS, AND I WAS UNAWARE OF THE COMPASS PRECESSION. WHEN I LANDED AT SCOTTSDALE, I CALLED THE X AVIONICS SHOP AND MADE THEM AWARE OF THE FAILURE, AND THEY CONTACTED Y AVIONICS TO REPAIR THE GYROS. I FEEL THAT DUE TO THE DISTR I EXPERIENCED WITH THE ATTITUDE GYRO, AND TRYING TO CORRECT THAT PROB, IT CONTRIBUTED TO ME BEING UNAWARE THE ACFT WAS IN A SLOW TURN TO THE S THAT PUT THE ACFT IN THE RESTR AREA.

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.