LTT DEPARTS AND HAS LOST COM SIT. RETURN LAND.

Narrative

CAPT AND MYSELF TAXIED OUT TO RWY TO CHK THE EXTENT OF TSTM COVERAGE AROUND THE ACY AREA FOR FERRY FLT TO PHL. DURING TAXI; GND CTL ADVISED US THAT WE HAD A STUCK MIKE FOR ABOUT 4 MINS AS WE TAXIED AND CHKED WX RADAR ONBOARD. CAPT AND MYSELF DISCUSSED WX AND PROBABILITY OF A DEP. WE ALSO DISCUSSED THE POSSIBLE CAUSE OF THE STUCK MIKE AND ACTIONS WE WOULD TAKE IF RADIO PROBS OCCURRED ENRTE. WE DECIDED TO DEPART AND RPTED THE LACK OF CONVECTIVE ACTIVITY TO GND CTLR AND 3 COMPANY ACFT AWAITING OUR PIREP. AFTER RECEIVING TKOF CLRNC; WE ONCE AGAIN CHKED WX RADAR ON DEP PATH; THEN ADVISED TWR WE WERE STARTING THE TKOF ROLL. TWR ACKNOWLEDGED ALL OUR COM. AS WE ROTATED; OUR 'HOT MIKES' FAILED AND WHEN ASKED TO CONTACT DEP WE (CAPT) ACKNOWLEDGED AND NOTICED XMIT ANNUNCIATOR DID NOT EXTINGUISH ON RADIO. CAPT WAS UNABLE TO RAISE DEP AND ASKED ME TO RELINQUISH CTLS AND BECOME PNF. I; TOO; WAS UNABLE TO CONTACT DEP. CAPT ADVISED WE WOULD RETURN TO THE FIELD AS PLANNED; IN EVENT OF COM FAILURE. AS CAPT CIRCLED AIRFIELD FOR L TFC; I CONTINUED TO ATTEMPT RADIO CONTACT WITH TWR AND GND CTLRS. MIKE WAS STICKING INTERMITTENTLY; BUT COM WAS NOT POSSIBLE. I ADVISED CAPT TO LOOK FOR LIGHT GUN SIGNAL AND HEARD TWR CLR US TO LAND. CAPT OVERSHOT RWY AND MADE R 270 DEG TO REINTERCEPT SUCCESSFULLY. ON FINAL; WE SAW GREEN LIGHT GUN AND; AFTER LNDG WE AGAIN SAW THE STEADY GREEN; AND TAXIED TO GATE WITHOUT INCIDENT. AFTER DISCUSSION OF EVENTS WITH CAPT; WE DETERMINED THAT RADIO COMPARTMENT HAD BEEN SATURATED AS ACFT SAT OUTSIDE DURING STORM (APPROX 2 HRS). THIS HAD CAUSED THE AVIONICS PROBS. WE WERE BOTH PLEASED WITH OUR PERFORMANCE IN RETURNING TO FIELD. HOWEVER; WE AGREED THAT IT WAS A POOR DECISION TO ATTEMPT A TKOF AFTER HAVING RADIO PROBS IN THIS SIT. I HAVE LEARNED THAT CERTAIN SITS REQUIRE ALL EQUIP TO BE WORKING PERFECTLY -- LIKE A DEP INTO NIGHT IFR WITH TSTMS ENRTE.