Cpr Y pilot non adherence to ATC clearance unauthorized descent through occupied altitude had less t...

Attributes
ACN	182589
Time
Date	199107
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : crl
State Reference	MI
Altitude	msl bound lower : 12000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob tracon : dtw
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : direct enroute airway : zob
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 12000 flight time type : 1000
ASRS Report	182589
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated faa : reviewed incident with flight crew
Miss Distance	horizontal : 6000 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On arrival into dtw, air carrier X was vectored through V98 for spacing. We were cleared to intercept V98 and descend to 12000 ft. We were told to look for cpr Y at 1 O'clock and 13000 ft. When we saw cpr Y he was descending through 13000 ft on a converging course. We checked our TCAS and watched him descend. We received a resolution alert to climb. Since the converging cpr Y was 200 ft above us and in sight, I chose to turn left to miss him and keep him in sight. Supplemental information from acn 182781: air carrier X on a 100-110 vector to intercept V98 at mizar at 12000 ft. Cleveland center calls out traffic (a cpr Y at 13000 ft at 1 O'clock 5- 6 mi). We call traffic in sight and continue to maintain visual contact on the cpr Y during the entire incident. As we intercept the V98 we noticed that the cpr Y was on our same heading and appeared to be at our altitude of 12000 ft. We were now in trail at 7 O'clock and our TCAS was showing the cpr Y to be 200 ft above us. We were attempting to clarify the situation with cleveland center but were handed off to approach instead. We were now rapidly closing on the cpr Y and attempting to quickly clarify the situation with detroit approach. While detroit approach was attempting to sort all this out, we advised them of our urgent need to take evasive action and then did so by turning away approximately 45 degree. Approach then sent the cpr Y down to 11000 ft and had us then turn back towards the detroit airport (on vectors) at 12000 ft. We also had a TA (traffic alert) and then an RA (resolution alert) on our TCAS during this. Callback conversation with reporter revealed the following information: the reporter stated the captain reviewed the incident with dtw approach control supervisor. The dtw supervisor had stated the cpr Y pilot had been assigned 13000 ft but descended below his assigned altitude. Reporter stated the TCASII, RA told the flight crew to climb. Captain elected to turn so as to keep cpr Y in sight. Reporter stated approach control told cpr Y to maintain 11000 ft. Cpr Y had descended below assigned altitude and approach controller told him to get back to assigned altitude and pay attention.

Original NASA ASRS Text

Title: CPR Y PLT NON ADHERENCE TO ATC CLRNC UNAUTHORIZED DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR X TCASII RA EVASIVE ACTION TAKEN.

Narrative: ON ARR INTO DTW, ACR X WAS VECTORED THROUGH V98 FOR SPACING. WE WERE CLRED TO INTERCEPT V98 AND DSND TO 12000 FT. WE WERE TOLD TO LOOK FOR CPR Y AT 1 O'CLOCK AND 13000 FT. WHEN WE SAW CPR Y HE WAS DSNDING THROUGH 13000 FT ON A CONVERGING COURSE. WE CHKED OUR TCAS AND WATCHED HIM DSND. WE RECEIVED A RESOLUTION ALERT TO CLB. SINCE THE CONVERGING CPR Y WAS 200 FT ABOVE US AND IN SIGHT, I CHOSE TO TURN L TO MISS HIM AND KEEP HIM IN SIGHT. SUPPLEMENTAL INFO FROM ACN 182781: ACR X ON A 100-110 VECTOR TO INTERCEPT V98 AT MIZAR AT 12000 FT. CLEVELAND CENTER CALLS OUT TFC (A CPR Y AT 13000 FT AT 1 O'CLOCK 5- 6 MI). WE CALL TFC IN SIGHT AND CONTINUE TO MAINTAIN VISUAL CONTACT ON THE CPR Y DURING THE ENTIRE INCIDENT. AS WE INTERCEPT THE V98 WE NOTICED THAT THE CPR Y WAS ON OUR SAME HDG AND APPEARED TO BE AT OUR ALT OF 12000 FT. WE WERE NOW IN TRAIL AT 7 O'CLOCK AND OUR TCAS WAS SHOWING THE CPR Y TO BE 200 FT ABOVE US. WE WERE ATTEMPTING TO CLARIFY THE SITUATION WITH CLEVELAND CENTER BUT WERE HANDED OFF TO APCH INSTEAD. WE WERE NOW RAPIDLY CLOSING ON THE CPR Y AND ATTEMPTING TO QUICKLY CLARIFY THE SITUATION WITH DETROIT APCH. WHILE DETROIT APCH WAS ATTEMPTING TO SORT ALL THIS OUT, WE ADVISED THEM OF OUR URGENT NEED TO TAKE EVASIVE ACTION AND THEN DID SO BY TURNING AWAY APPROX 45 DEG. APCH THEN SENT THE CPR Y DOWN TO 11000 FT AND HAD US THEN TURN BACK TOWARDS THE DETROIT ARPT (ON VECTORS) AT 12000 FT. WE ALSO HAD A TA (TFC ALERT) AND THEN AN RA (RESOLUTION ALERT) ON OUR TCAS DURING THIS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFORMATION: THE RPTR STATED THE CAPT REVIEWED THE INCIDENT WITH DTW APCH CTL SUPVR. THE DTW SUPVR HAD STATED THE CPR Y PLT HAD BEEN ASSIGNED 13000 FT BUT DSNDED BELOW HIS ASSIGNED ALT. RPTR STATED THE TCASII, RA TOLD THE FLC TO CLB. CAPT ELECTED TO TURN SO AS TO KEEP CPR Y IN SIGHT. RPTR STATED APCH CTL TOLD CPR Y TO MAINTAIN 11000 FT. CPR Y HAD DSNDED BELOW ASSIGNED ALT AND APCH CTLR TOLD HIM TO GET BACK TO ASSIGNED ALT AND PAY ATTN.

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.

Cpr Y pilot non adherence to ATC clearance unauthorized descent through occupied altitude had less than standard separation from air carrier X TCASII RA evasive action taken.