Pilot of cpr aircraft experiences wake turbulence on visual approach with heavy traffic. Altitude de...

Attributes
ACN	383389
Time
Date	199710
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : las
State Reference	NV
Altitude	msl bound lower : 6000 msl bound upper : 6700
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : las
Operator	general aviation : corporate
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : visual arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 75 flight time total : 10250 flight time type : 75
ASRS Report	383389
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter other non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	faa : reviewed incident with flight crew
Supplementary
Air Traffic Incident	other

Narrative:

Many aircraft in approach sequence with las control saturated to the extent that many heading changes were experienced by numerous aircraft. My assigned altitude was 6000 ft. I believe I was cleared for a visual approach behind a B737 from a heading to contact las tower 7 NM east. On my heading I experienced wake turbulence that disengaged my autoplt and caused an increase in altitude of 600-700 ft. I recovered my altitude and contacted las tower. Altitude gain should not be a problem. In fact, I was cleared for the visual approach. When I'd shut down I called las tower and explained my situation and was told they were not aware of any problems. I feel under the busy environment there was not a lot I could have done to prevent what had happened.

Original NASA ASRS Text

Title: PLT OF CPR ACFT EXPERIENCES WAKE TURB ON VISUAL APCH WITH HVY TFC. ALTDEV RESULTS.

Narrative: MANY ACFT IN APCH SEQUENCE WITH LAS CTL SATURATED TO THE EXTENT THAT MANY HDG CHANGES WERE EXPERIENCED BY NUMEROUS ACFT. MY ASSIGNED ALT WAS 6000 FT. I BELIEVE I WAS CLRED FOR A VISUAL APCH BEHIND A B737 FROM A HDG TO CONTACT LAS TWR 7 NM E. ON MY HDG I EXPERIENCED WAKE TURB THAT DISENGAGED MY AUTOPLT AND CAUSED AN INCREASE IN ALT OF 600-700 FT. I RECOVERED MY ALT AND CONTACTED LAS TWR. ALT GAIN SHOULD NOT BE A PROB. IN FACT, I WAS CLRED FOR THE VISUAL APCH. WHEN I'D SHUT DOWN I CALLED LAS TWR AND EXPLAINED MY SIT AND WAS TOLD THEY WERE NOT AWARE OF ANY PROBS. I FEEL UNDER THE BUSY ENVIRONMENT THERE WAS NOT A LOT I COULD HAVE DONE TO PREVENT WHAT HAD HAPPENED.

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.

Pilot of cpr aircraft experiences wake turbulence on visual approach with heavy traffic. Altitude deviation results.