A freight operation using a C414 flew using a GPS system that had not been signed off by the FAA. The flight crew operators plead ignorance of the requirements regarding avionics installations.

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Attributes
ACN	378760
Time
Date	199708
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Chancellor 414A & C414
Operating Under FAR Part	Part 135
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 60 flight time total : 4000 flight time type : 400
ASRS Report	378760
Person 2
Affiliation	company : air carrier
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : atp pilot : instrument
Experience	flight time last 90 days : 100 flight time total : 2800 flight time type : 400
ASRS Report	378759
Events
Anomaly	non adherence : published procedure non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Aug/xa/97 we had a northstar M3 GPS installed in our C414. Through a series of miscoms and our unfamiliarity with FAA regulations regarding avionics installations, the aircraft was flown several times without block #3 on form 337 being signed by the FAA. We have now been informed that this may have caused the aircraft to be illegal.

Original NASA ASRS Text

Title: A FREIGHT OP USING A C414 FLEW USING A GPS SYS THAT HAD NOT BEEN SIGNED OFF BY THE FAA. THE FLC OPERATORS PLEAD IGNORANCE OF THE REQUIREMENTS REGARDING AVIONICS INSTALLATIONS.

Narrative: AUG/XA/97 WE HAD A NORTHSTAR M3 GPS INSTALLED IN OUR C414. THROUGH A SERIES OF MISCOMS AND OUR UNFAMILIARITY WITH FAA REGS REGARDING AVIONICS INSTALLATIONS, THE ACFT WAS FLOWN SEVERAL TIMES WITHOUT BLOCK #3 ON FORM 337 BEING SIGNED BY THE FAA. WE HAVE NOW BEEN INFORMED THAT THIS MAY HAVE CAUSED THE ACFT TO BE ILLEGAL.

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.