TCASII RA when small transport deviations from assigned altitude and descends 500 ft to remain clear...

Attributes
ACN	184770
Time
Date	199107
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	msl bound lower : 6000 msl bound upper : 6500
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : stl
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 270 flight time total : 6000 flight time type : 4000
ASRS Report	184770
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 270 flight time total : 10000 flight time type : 6000
ASRS Report	186149
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 3000 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We departed stl. Departure control said turn left 210 degree, maintain 6000 ft, intercept J101. Traffic was called at 6500 moving left to right. Additional traffic right to left at 7000 ft air carrier. There was a cloud layer at 6200 ft in that area. We received a TA on our TCAS. Then a RA on our TCAS. The traffic left to right had asked departure for a descent to stay clear of clouds (VFR). Departure said unable due to traffic. Our TCAS showed him descending into us. We received a RA and followed TCAS evasive maneuvering descended down to 5500 ft at which time I saw an small transport cross in front of us at 6000 ft, stl departure was informed of TCAS deviation and of the small transport not maintaining his altitude when he told stl departure 118.95 he was at 6500 ft. He subsequently informed stl departure he did descend to maintain VFR. Stl departure is in process of filing against small transport.

Original NASA ASRS Text

Title: TCASII RA WHEN SMT DEVS FROM ASSIGNED ALT AND DSNDS 500 FT TO REMAIN CLR OF CLOUDS.

Narrative: WE DEPARTED STL. DEP CTL SAID TURN L 210 DEG, MAINTAIN 6000 FT, INTERCEPT J101. TFC WAS CALLED AT 6500 MOVING L TO R. ADDITIONAL TFC R TO L AT 7000 FT AIR CARRIER. THERE WAS A CLOUD LAYER AT 6200 FT IN THAT AREA. WE RECEIVED A TA ON OUR TCAS. THEN A RA ON OUR TCAS. THE TFC L TO R HAD ASKED DEP FOR A DSCNT TO STAY CLR OF CLOUDS (VFR). DEP SAID UNABLE DUE TO TFC. OUR TCAS SHOWED HIM DSNDING INTO US. WE RECEIVED A RA AND FOLLOWED TCAS EVASIVE MANEUVERING DSNDED DOWN TO 5500 FT AT WHICH TIME I SAW AN SMT CROSS IN FRONT OF US AT 6000 FT, STL DEP WAS INFORMED OF TCAS DEV AND OF THE SMT NOT MAINTAINING HIS ALT WHEN HE TOLD STL DEP 118.95 HE WAS AT 6500 FT. HE SUBSEQUENTLY INFORMED STL DEP HE DID DSND TO MAINTAIN VFR. STL DEP IS IN PROCESS OF FILING AGAINST SMT.

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.

TCASII RA when small transport deviations from assigned altitude and descends 500 ft to remain clear of clouds.