<< >> NASA ASRS Report 1338091, March 2016

Md-83 captain reported that only the TA function of the TCAS system was operational and requested clearance into non-rvsm airspace.

Attributes
ACN	1338091
Time
Date	201603
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	MD-83
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Traffic Collision Avoidance System (TCAS)
Person 1
Function	Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Aircraft Equipment Problem Less Severe Deviation - Procedural FAR Deviation - Procedural Published Material / Policy

Narrative:

About half way into our flight; the vsi was showing 'TA only'. I asked the pilot monitoring (pm) to inform ATC that only the TA function of our TCAS system was operational; and could they descend us into non-rvsm airspace. ATC said; that's okay; we have you on radar. At this point; the 'TA only' message was gone; so the pm did not say anything further to ATC about the TCAS being a company requirement for rvsm operations. About 10 minutes later the 'TA only' message reappeared; and I now requested to descend to FL280. Shortly after leveling at FL280; the 'TA only' message disappeared.

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Original NASA ASRS Text

Title: MD-83 Captain reported that only the TA function of the TCAS system was operational and requested clearance into non-RVSM airspace.

Narrative: About half way into our flight; the VSI was showing 'TA only'. I asked the Pilot Monitoring (PM) to inform ATC that only the TA function of our TCAS system was operational; and could they descend us into non-RVSM airspace. ATC said; that's okay; we have you on radar. At this point; the 'TA only' message was gone; so the PM did not say anything further to ATC about the TCAS being a company requirement for RVSM operations. About 10 minutes later the 'TA only' message reappeared; and I now requested to descend to FL280. Shortly after leveling at FL280; the 'TA only' message disappeared.

Data retrieved from NASA's ASRS site 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.