Charter cargo aircraft has relay problem, unable to communication. Return land.

Attributes
ACN	248985
Time
Date	199308
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ptk
State Reference	MI
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw tower : ptk
Operator	common carrier : air taxi
Make Model Name	Small Transport
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 160 flight time total : 7000 flight time type : 50
ASRS Report	248985
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

I departed ptk, was told to contact detroit approach for VFR flight advisories. When the relay for the microphone quit, making it unable to broadcast, I tried a second time but was unable to communicate. Was approximately 7 mi east of ptk. Turned back for the airport at 3000 ft. I then squawked 7700-7600- 7700-7600. Stayed well north of left downwind for runway 9R, the same runway I departed. Looked for light gun signals, did not see any. Looked for traffic, there wasn't any. Entered pattern and landed safely.

Original NASA ASRS Text

Title: CHARTER CARGO ACFT HAS RELAY PROB, UNABLE TO COM. RETURN LAND.

Narrative: I DEPARTED PTK, WAS TOLD TO CONTACT DETROIT APCH FOR VFR FLT ADVISORIES. WHEN THE RELAY FOR THE MIKE QUIT, MAKING IT UNABLE TO BROADCAST, I TRIED A SECOND TIME BUT WAS UNABLE TO COMMUNICATE. WAS APPROX 7 MI E OF PTK. TURNED BACK FOR THE ARPT AT 3000 FT. I THEN SQUAWKED 7700-7600- 7700-7600. STAYED WELL N OF L DOWNWIND FOR RWY 9R, THE SAME RWY I DEPARTED. LOOKED FOR LIGHT GUN SIGNALS, DID NOT SEE ANY. LOOKED FOR TFC, THERE WASN'T ANY. ENTERED PATTERN AND LANDED SAFELY.

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.