Turbulence causes altitude and speed deviation during vectors for an approach.

Attributes
ACN	197269
Time
Date	199112
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 2600 msl bound upper : 3000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Experience	flight time total : 4000 flight time type : 1000
ASRS Report	197269
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 : weather other anomaly other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Moderate to severe turbulence at 3000 ft MSL at dfw airport. After flying in this turbulence for 5-10 mins, we were quickly given our base and final vectors and cleared for the ILS 36L. Because of the attention required just to maintain aircraft control in the turbulence, we overshot final approach course. Approach control told us to break off the approach and to maintain 3000 ft and turn left to 270 degree. Because of the turbulence, we dropped to approximately 2600 ft and our speed was above 250 KTS. For the next approach, we configured earlier, rode out the turbulence and landed just as an large transport was clearing the runway near the departure end. As we were clearing the runway, the aircraft following us was on a 1/2 mi final, when he gave his PIREP of moderate to severe turbulence throughout the approach. Slow and configure early!

Original NASA ASRS Text

Title: TURB CAUSES ALT AND SPD DEV DURING VECTORS FOR AN APCH.

Narrative: MODERATE TO SEVERE TURB AT 3000 FT MSL AT DFW ARPT. AFTER FLYING IN THIS TURB FOR 5-10 MINS, WE WERE QUICKLY GIVEN OUR BASE AND FINAL VECTORS AND CLRED FOR THE ILS 36L. BECAUSE OF THE ATTN REQUIRED JUST TO MAINTAIN ACFT CTL IN THE TURB, WE OVERSHOT FINAL APCH COURSE. APCH CTL TOLD US TO BREAK OFF THE APCH AND TO MAINTAIN 3000 FT AND TURN L TO 270 DEG. BECAUSE OF THE TURB, WE DROPPED TO APPROX 2600 FT AND OUR SPD WAS ABOVE 250 KTS. FOR THE NEXT APCH, WE CONFIGURED EARLIER, RODE OUT THE TURB AND LANDED JUST AS AN LGT WAS CLRING THE RWY NEAR THE DEP END. AS WE WERE CLRING THE RWY, THE ACFT FOLLOWING US WAS ON A 1/2 MI FINAL, WHEN HE GAVE HIS PIREP OF MODERATE TO SEVERE TURB THROUGHOUT THE APCH. SLOW AND CONFIGURE EARLY!

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.