Corp flight crew on test flight has inoperative mode C. Creates 2 TCASII alerts for acrs.

Attributes
ACN	198585
Time
Date	199201
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bal airport : mtn
State Reference	MD
Altitude	msl bound lower : 2500 msl bound upper : 12500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bwi
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude climbout : initial
Flight Plan	None
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp pilot : cfi
Experience	flight time last 90 days : 150 flight time total : 20000 flight time type : 100
ASRS Report	198585
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe non adherence : far other anomaly other other anomaly other
Independent Detector	other controllera other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departed mtn airport VFR (in good VFR WX). Leveled off at 2500 ft altitude to remain below TCA floor. At 21 DME north balance VOR started rapid climb to 12500 ft to level on cvr installation. Flew 45 mi north balance VOR -- proceeded back to mtw. Contacted balance approach at 12500 ft, 38 mi north balance and requested IFR to mtn for ILS 32, which was approved. Balance approach advised they had report from air carrier plane that his TCASII alerted him as to our position (not a conflict). We also had him in sight above and to our right a good distance. Balance advised a second air carrier TCASII also showed our position. He was below us, no conflict. Balance was not receiving our mode C during this time for unknown reasons. I contacted controller at balance. He said matter was settled as they received many reports from TCASII equipped aircraft reporting aircraft that are not creating a traffic conflict. Recommend traffic control be left with controllers and not with airline pilots.

Original NASA ASRS Text

Title: CORP FLC ON TEST FLT HAS INOP MODE C. CREATES 2 TCASII ALERTS FOR ACRS.

Narrative: DEPARTED MTN ARPT VFR (IN GOOD VFR WX). LEVELED OFF AT 2500 FT ALT TO REMAIN BELOW TCA FLOOR. AT 21 DME N BAL VOR STARTED RAPID CLB TO 12500 FT TO LEVEL ON CVR INSTALLATION. FLEW 45 MI N BAL VOR -- PROCEEDED BACK TO MTW. CONTACTED BAL APCH AT 12500 FT, 38 MI N BAL AND REQUESTED IFR TO MTN FOR ILS 32, WHICH WAS APPROVED. BAL APCH ADVISED THEY HAD RPT FROM ACR PLANE THAT HIS TCASII ALERTED HIM AS TO OUR POS (NOT A CONFLICT). WE ALSO HAD HIM IN SIGHT ABOVE AND TO OUR R A GOOD DISTANCE. BAL ADVISED A SECOND ACR TCASII ALSO SHOWED OUR POS. HE WAS BELOW US, NO CONFLICT. BAL WAS NOT RECEIVING OUR MODE C DURING THIS TIME FOR UNKNOWN REASONS. I CONTACTED CTLR AT BAL. HE SAID MATTER WAS SETTLED AS THEY RECEIVED MANY RPTS FROM TCASII EQUIPPED ACFT RPTING ACFT THAT ARE NOT CREATING A TFC CONFLICT. RECOMMEND TFC CTL BE LEFT WITH CTLRS AND NOT WITH AIRLINE PLTS.

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.