Speed deviation during a visual descent procedure.

Attributes
ACN	300790
Time
Date	199503
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : boi
State Reference	ID
Altitude	msl bound lower : 9000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : boi
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	enroute airway : boi
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	SA-227 AC Metro III
Operating Under FAR Part	Part 135
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 240 flight time total : 17000 flight time type : 240
ASRS Report	300790
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : cfi
Experience	flight time last 90 days : 210 flight time total : 14000 flight time type : 210
ASRS Report	300539
Events
Anomaly	conflict : airborne less severe non adherence : far other anomaly
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Approximately 50 NM east of boi still at 15000 ft due to a metroliner at 11000 ft at our 10:30 to 11:00 O'clock on an intersecting course. Approach asked if we could descend quickly below the metroliner and keep it in sight (6 mi ahead). We said we could. We started a descent of 4000-5000 FPM which would have taken us below and past the metroliner. As we got closer, the metroliner began a descent. Approach tried many times to contact the metroliner. He finally answered on the 4TH call. The captain told me, the first officer, to continue the descent to insure we had the instructed clearance. Our lateral clearance was not a problem as the metroliner was about to parallel us for the parallel runway. The captain instructed me, the first officer, to continue the descent below 10000 ft even though we were not at 250 KTS. We were approximately 290 KTS and slowing rapidly. There was never a conflict or comment by approach but we did exceed the 250 KTS limit below 10000 ft.

Original NASA ASRS Text

Title: SPD DEV DURING A VISUAL DSCNT PROC.

Narrative: APPROX 50 NM E OF BOI STILL AT 15000 FT DUE TO A METROLINER AT 11000 FT AT OUR 10:30 TO 11:00 O'CLOCK ON AN INTERSECTING COURSE. APCH ASKED IF WE COULD DSND QUICKLY BELOW THE METROLINER AND KEEP IT IN SIGHT (6 MI AHEAD). WE SAID WE COULD. WE STARTED A DSCNT OF 4000-5000 FPM WHICH WOULD HAVE TAKEN US BELOW AND PAST THE METROLINER. AS WE GOT CLOSER, THE METROLINER BEGAN A DSCNT. APCH TRIED MANY TIMES TO CONTACT THE METROLINER. HE FINALLY ANSWERED ON THE 4TH CALL. THE CAPT TOLD ME, THE FO, TO CONTINUE THE DSCNT TO INSURE WE HAD THE INSTRUCTED CLRNC. OUR LATERAL CLRNC WAS NOT A PROB AS THE METROLINER WAS ABOUT TO PARALLEL US FOR THE PARALLEL RWY. THE CAPT INSTRUCTED ME, THE FO, TO CONTINUE THE DSCNT BELOW 10000 FT EVEN THOUGH WE WERE NOT AT 250 KTS. WE WERE APPROX 290 KTS AND SLOWING RAPIDLY. THERE WAS NEVER A CONFLICT OR COMMENT BY APCH BUT WE DID EXCEED THE 250 KTS LIMIT BELOW 10000 FT.

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.