GA small aircraft misses speed restriction on approach at ord.

Attributes
ACN	148616
Time
Date	199006
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord tracon : dfw
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 25 flight time total : 3500 flight time type : 300
ASRS Report	148616
Person 2
Affiliation	Other
Function	observation : observer
Qualification	pilot : private
Events
Anomaly	non adherence : clearance other anomaly
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

WX cavu on approach to runway 9R at ord. Pilot in right seat had been flying aircraft prior to receiving clearance for visibility approach. Left seat (PIC) pilot took over flying upon receipt of clearance for visibility and right seat pilot took over radio duties. Approach clearance was to maintain 170 KTS to final approach fix, this restriction (to maintain 170 KT) was missed by both pilots. PIC began slowing aircraft to gear/flap speed of 150 KTS. Tower advised aircraft to return to approach controller who requested speed, and was advised that aircraft was at 150 KTS. This slow down occurred 1-2 mi west of final approach fix. Approach requested speed back to 170 KTS. Aircraft was accelerated back to 175 KTS to marker. No further comments made. Problem arose from 2 sources. Crew duty transition at receipt of approach clearance probably was distracting factor causing both pilots to miss the speed requirement. While multi-engine high performance reciprocating twin is capable of the speed requested, west/O speed brakes or spoilers, given the retention at altitudes 3000'-4000' close in, it is difficult to slow aircraft and descend close to marker when operating substantially above gear speed. If controller had allowed as little as one min more spacing (1-2 mi even) for faster following aircraft, reciprocating twins would have sufficient time to slow for gear flaps (150 KTS).

Original NASA ASRS Text

Title: GA SMA MISSES SPEED RESTRICTION ON APCH AT ORD.

Narrative: WX CAVU ON APCH TO RWY 9R AT ORD. PLT IN R SEAT HAD BEEN FLYING ACFT PRIOR TO RECEIVING CLRNC FOR VIS APCH. L SEAT (PIC) PLT TOOK OVER FLYING UPON RECEIPT OF CLRNC FOR VIS AND R SEAT PLT TOOK OVER RADIO DUTIES. APCH CLRNC WAS TO MAINTAIN 170 KTS TO FINAL APCH FIX, THIS RESTRICTION (TO MAINTAIN 170 KT) WAS MISSED BY BOTH PLTS. PIC BEGAN SLOWING ACFT TO GEAR/FLAP SPD OF 150 KTS. TWR ADVISED ACFT TO RETURN TO APCH CTLR WHO REQUESTED SPD, AND WAS ADVISED THAT ACFT WAS AT 150 KTS. THIS SLOW DOWN OCCURRED 1-2 MI W OF FINAL APCH FIX. APCH REQUESTED SPD BACK TO 170 KTS. ACFT WAS ACCELERATED BACK TO 175 KTS TO MARKER. NO FURTHER COMMENTS MADE. PROB AROSE FROM 2 SOURCES. CREW DUTY TRANSITION AT RECEIPT OF APCH CLRNC PROBABLY WAS DISTRACTING FACTOR CAUSING BOTH PLTS TO MISS THE SPD REQUIREMENT. WHILE MULTI-ENG HIGH PERFORMANCE RECIPROCATING TWIN IS CAPABLE OF THE SPD REQUESTED, W/O SPD BRAKES OR SPOILERS, GIVEN THE RETENTION AT ALTS 3000'-4000' CLOSE IN, IT IS DIFFICULT TO SLOW ACFT AND DSND CLOSE TO MARKER WHEN OPERATING SUBSTANTIALLY ABOVE GEAR SPD. IF CTLR HAD ALLOWED AS LITTLE AS ONE MIN MORE SPACING (1-2 MI EVEN) FOR FASTER FOLLOWING ACFT, RECIPROCATING TWINS WOULD HAVE SUFFICIENT TIME TO SLOW FOR GEAR FLAPS (150 KTS).

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.