FA30 twin commander on GPS approach to M39 sustains 2 encounters with windshear and turbulence.

Attributes
ACN	464182
Time
Date	200002
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : m39.airport
State Reference	AR
Altitude	msl single value : 4200
Environment
Flight Conditions	IMC
Weather Elements	Turbulence Windshear
Light	Dawn
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Rockwell North American Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : instrument non precision
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 34 flight time total : 3740 flight time type : 15
ASRS Report	464182
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : turbulence inflight encounter : weather inflight encounter other non adherence : published procedure non adherence : clearance non adherence : far other anomaly
Independent Detector	atc equipment : msaw other controllera other flight crewa
Resolutory Action	controller : issued alert flight crew : regained aircraft control none taken : unable
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Aircraft Environmental Factor
Primary Problem	Ambiguous

Narrative:

We were on an IFR flight plan from hot-M39. Center cleared me to descend to 4200 ft, maintain 4200 ft until established on a segment of the approach and cleared for the pgs 17 approach mena. I made the procedure turn at batez and at batez I started the next segment of the approach. We encountered turbulence and windshear with a severe downdraft. I added full power with gear and flaps retracted and we (at vx) were still losing altitude. We finally started to climb and again a second windshear and I was able to maintain altitude but couldn't climb with full power. ATC advised me that my altitude was too low and by then I was on the next segment of the approach and altitude became so depicted on the approach plate. We made a normal landing. My main concern is that this approach is above a high ridge at batez. Many other aircraft have crashed on this same ridge. Could the severe downdrafts that are encountered be happening to others with a bad outcome? Praise the heavenly father for our good outcome.

Original NASA ASRS Text

Title: FA30 TWIN COMMANDER ON GPS APCH TO M39 SUSTAINS 2 ENCOUNTERS WITH WINDSHEAR AND TURB.

Narrative: WE WERE ON AN IFR FLT PLAN FROM HOT-M39. CTR CLRED ME TO DSND TO 4200 FT, MAINTAIN 4200 FT UNTIL ESTABLISHED ON A SEGMENT OF THE APCH AND CLRED FOR THE PGS 17 APCH MENA. I MADE THE PROC TURN AT BATEZ AND AT BATEZ I STARTED THE NEXT SEGMENT OF THE APCH. WE ENCOUNTERED TURB AND WINDSHEAR WITH A SEVERE DOWNDRAFT. I ADDED FULL PWR WITH GEAR AND FLAPS RETRACTED AND WE (AT VX) WERE STILL LOSING ALT. WE FINALLY STARTED TO CLB AND AGAIN A SECOND WINDSHEAR AND I WAS ABLE TO MAINTAIN ALT BUT COULDN'T CLB WITH FULL PWR. ATC ADVISED ME THAT MY ALT WAS TOO LOW AND BY THEN I WAS ON THE NEXT SEGMENT OF THE APCH AND ALT BECAME SO DEPICTED ON THE APCH PLATE. WE MADE A NORMAL LNDG. MY MAIN CONCERN IS THAT THIS APCH IS ABOVE A HIGH RIDGE AT BATEZ. MANY OTHER ACFT HAVE CRASHED ON THIS SAME RIDGE. COULD THE SEVERE DOWNDRAFTS THAT ARE ENCOUNTERED BE HAPPENING TO OTHERS WITH A BAD OUTCOME? PRAISE THE HEAVENLY FATHER FOR OUR GOOD OUTCOME.

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.