C172 CFI kept his transponder code on pct's assigned squawk code, returns and lands, when his VHF receiver is malfunctioning after departure from fme, md.

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Attributes
ACN	616492
Time
Date	200404
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : fme.airport
State Reference	MD
Altitude	msl single value : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pct.tracon
Operator	general aviation : instructional
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	climbout : takeoff climbout : initial climbout : intermediate altitude
Route In Use	departure : vfr
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 45 flight time total : 295 flight time type : 180
ASRS Report	616492
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	flight crew : diverted to another airport flight crew : landed as precaution other
Consequence	other
Supplementary
Problem Areas	Airspace Structure Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

I had filed an ADIZ flight plan with the flight service station, and prior to taking off from tipton airport (fort meade), contacted the potomac TRACON for a discrete ADIZ squawk code. I put in the squawk code, and took off from tipton, after listening to local advisories. On climb out, I realized that while I could hear various communications from the approach facilities, I could not talk to them. Since radio contact is essential for operating in the ADIZ, I elected to land immediately. During the landing phase, the transponder was still set to a discrete ADIZ code, and not 7600. Thus, in my opinion, during the landing phase, potomac TRACON may have thought that I was not in compliance with the ADIZ procedures. While no contacts were made on their behalf, I feel as though in the event like this taking place again, it would be more appropriate to have code 7600 in the transponder.

Original NASA ASRS Text

Title: C172 CFI KEPT HIS XPONDER CODE ON PCT'S ASSIGNED SQUAWK CODE, RETURNS AND LANDS, WHEN HIS VHF RECEIVER IS MALFUNCTIONING AFTER DEP FROM FME, MD.

Narrative: I HAD FILED AN ADIZ FLT PLAN WITH THE FLT SVC STATION, AND PRIOR TO TAKING OFF FROM TIPTON ARPT (FORT MEADE), CONTACTED THE POTOMAC TRACON FOR A DISCRETE ADIZ SQUAWK CODE. I PUT IN THE SQUAWK CODE, AND TOOK OFF FROM TIPTON, AFTER LISTENING TO LCL ADVISORIES. ON CLBOUT, I REALIZED THAT WHILE I COULD HEAR VARIOUS COMS FROM THE APCH FACILITIES, I COULD NOT TALK TO THEM. SINCE RADIO CONTACT IS ESSENTIAL FOR OPERATING IN THE ADIZ, I ELECTED TO LAND IMMEDIATELY. DURING THE LNDG PHASE, THE XPONDER WAS STILL SET TO A DISCRETE ADIZ CODE, AND NOT 7600. THUS, IN MY OPINION, DURING THE LNDG PHASE, POTOMAC TRACON MAY HAVE THOUGHT THAT I WAS NOT IN COMPLIANCE WITH THE ADIZ PROCS. WHILE NO CONTACTS WERE MADE ON THEIR BEHALF, I FEEL AS THOUGH IN THE EVENT LIKE THIS TAKING PLACE AGAIN, IT WOULD BE MORE APPROPRIATE TO HAVE CODE 7600 IN THE XPONDER.

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.