Light transport flight crew lands on wet runway. Braking fails and aircraft goes off end of runway.

Attributes
ACN	151794
Time
Date	199007
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mwc
State Reference	MI
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mex
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 15 flight time total : 8000 flight time type : 400
ASRS Report	151794
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 27 flight time total : 4400 flight time type : 3
ASRS Report	151925
Events
Anomaly	other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable
Consequence	faa : investigated other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After landing on wet runway, braking action failed for yet unknown reason causing aircraft to depart end of runway. Callback conversation with reporter revealed the following: reporter states there is a flaw in the system such that a nice easy landing is counterproductive. A major flight training organization had this same thing happen to them and now teaches to plant the aircraft firmly on the end of the runway. If that does not occur the squat switch will not engage due to lack of compression of the strut and braking will not engage. Mfr of course says this does not occur, but experience shows it does. He is living proof. Supplemental information from acn 151925: departed mle at 1300 lt. Normal takeoff, en route cruise, approach and T/D. After T/D on 4100' long runway, had no brakes on light transport. Aircraft not equipped with thrust reversers or drag chute. We had no sensation of deceleration due to braking efforts. Aircraft left runway, rolled down on embankment and stopped after colliding with a barbed-wire fence and very small trees (saplings). I feel the captain did a good job of maintain control of aircraft throughout the entire incident. Callback conversation with reporter revealed the following: reporter states the anti-lock braking needs to be compressed some way or the micro switch won't allow the brakes to engage. Suggested his captain would explain more.

Original NASA ASRS Text

Title: LTT FLT CREW LANDS ON WET RWY. BRAKING FAILS AND ACFT GOES OFF END OF RWY.

Narrative: AFTER LNDG ON WET RWY, BRAKING ACTION FAILED FOR YET UNKNOWN REASON CAUSING ACFT TO DEPART END OF RWY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR STATES THERE IS A FLAW IN THE SYS SUCH THAT A NICE EASY LNDG IS COUNTERPRODUCTIVE. A MAJOR FLT TRNING ORGANIZATION HAD THIS SAME THING HAPPEN TO THEM AND NOW TEACHES TO PLANT THE ACFT FIRMLY ON THE END OF THE RWY. IF THAT DOES NOT OCCUR THE SQUAT SWITCH WILL NOT ENGAGE DUE TO LACK OF COMPRESSION OF THE STRUT AND BRAKING WILL NOT ENGAGE. MFR OF COURSE SAYS THIS DOES NOT OCCUR, BUT EXPERIENCE SHOWS IT DOES. HE IS LIVING PROOF. SUPPLEMENTAL INFO FROM ACN 151925: DEPARTED MLE AT 1300 LT. NORMAL TKOF, ENRTE CRUISE, APCH AND T/D. AFTER T/D ON 4100' LONG RWY, HAD NO BRAKES ON LTT. ACFT NOT EQUIPPED WITH THRUST REVERSERS OR DRAG CHUTE. WE HAD NO SENSATION OF DECELERATION DUE TO BRAKING EFFORTS. ACFT LEFT RWY, ROLLED DOWN ON EMBANKMENT AND STOPPED AFTER COLLIDING WITH A BARBED-WIRE FENCE AND VERY SMALL TREES (SAPLINGS). I FEEL THE CAPT DID A GOOD JOB OF MAINTAIN CTL OF ACFT THROUGHOUT THE ENTIRE INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR STATES THE ANTI-LOCK BRAKING NEEDS TO BE COMPRESSED SOME WAY OR THE MICRO SWITCH WON'T ALLOW THE BRAKES TO ENGAGE. SUGGESTED HIS CAPT WOULD EXPLAIN MORE.

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.