|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||airport : cmh|
|Altitude||agl bound lower : 0|
agl bound upper : 0
|Controlling Facilities||artcc : zdc|
|Operator||common carrier : air carrier|
|Make Model Name||Light Transport, Low Wing, 2 Turboprop Eng|
|Flight Phase||landing other|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 240|
flight time total : 7897
flight time type : 1143
|Affiliation||company : air carrier|
|Function||flight crew : first officer|
|Qualification||pilot : commercial|
pilot : instrument
|Anomaly||aircraft equipment problem : critical|
|Independent Detector||other flight crewa|
|Resolutory Action||flight crew : overcame equipment problem|
|Air Traffic Incident||other|
On landing rollout in an emb 120 at columbus, oh was unable to get the power levers below flight idle, nose wheel steering was inoperative, and normal brakes were inoperative. Aircraft maintained approximately 80 KTS and started to drift off runway to the left. Aileron and rudder provided a slight right turn, but after repeated attempts the above items remained inoperative. The aircraft started drifting right and the emergency hand brake was used to stop the aircraft, after which all system worked normally. Investigation revealed that oversvced struts and zero passenger/bags and a smooth landing caused struts not to compress and wet runway caused wheels not to come up to 50 KTS spin up, causing loss of the above system until struts compressed after aircraft came to a halt. I had no training as to this possibility, nor do I know of any reference to it in the afm or training manuals. This should be a required training item and included somewhere in the emb 120 afm. Callback conversation with reporter revealed the following information: reporter claims that his training department does not give enough emphasis on system and aircraft performance. The beta lock is provided to prevent a pilot from accidentally entering the beta range while in flight. There is no manual override. If the circuit breaker pops, there is no practical way to reset it during landing roll. Forcing the nose gear strut to compress using elevator may have regained use of the beta range and nose wheel steering. The lack of braking was probably due to hydroplaning which prevented the wheels from spinning up and activating the anti-skid. Brakes could have been regained if the anti-skid was turned off.
Original NASA ASRS Text
Title: DURING LNDG ROLL, FLC DISCOVERS THAT THE PROPS WOULD NOT GO INTO BETA RANGE, THE NOSE WHEEL STEERING WAS INOP AND THE BRAKES DID NOT WORK.
Narrative: ON LNDG ROLLOUT IN AN EMB 120 AT COLUMBUS, OH WAS UNABLE TO GET THE PWR LEVERS BELOW FLT IDLE, NOSE WHEEL STEERING WAS INOP, AND NORMAL BRAKES WERE INOP. ACFT MAINTAINED APPROX 80 KTS AND STARTED TO DRIFT OFF RWY TO THE L. AILERON AND RUDDER PROVIDED A SLIGHT RIGHT TURN, BUT AFTER REPEATED ATTEMPTS THE ABOVE ITEMS REMAINED INOP. THE ACFT STARTED DRIFTING R AND THE EMER HAND BRAKE WAS USED TO STOP THE ACFT, AFTER WHICH ALL SYS WORKED NORMALLY. INVESTIGATION REVEALED THAT OVERSVCED STRUTS AND ZERO PAX/BAGS AND A SMOOTH LNDG CAUSED STRUTS NOT TO COMPRESS AND WET RWY CAUSED WHEELS NOT TO COME UP TO 50 KTS SPIN UP, CAUSING LOSS OF THE ABOVE SYS UNTIL STRUTS COMPRESSED AFTER ACFT CAME TO A HALT. I HAD NO TRAINING AS TO THIS POSSIBILITY, NOR DO I KNOW OF ANY REF TO IT IN THE AFM OR TRAINING MANUALS. THIS SHOULD BE A REQUIRED TRAINING ITEM AND INCLUDED SOMEWHERE IN THE EMB 120 AFM. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR CLAIMS THAT HIS TRAINING DEPT DOES NOT GIVE ENOUGH EMPHASIS ON SYS AND ACFT PERFORMANCE. THE BETA LOCK IS PROVIDED TO PREVENT A PLT FROM ACCIDENTALLY ENTERING THE BETA RANGE WHILE IN FLT. THERE IS NO MANUAL OVERRIDE. IF THE CIRCUIT BREAKER POPS, THERE IS NO PRACTICAL WAY TO RESET IT DURING LNDG ROLL. FORCING THE NOSE GEAR STRUT TO COMPRESS USING ELEVATOR MAY HAVE REGAINED USE OF THE BETA RANGE AND NOSE WHEEL STEERING. THE LACK OF BRAKING WAS PROBABLY DUE TO HYDROPLANING WHICH PREVENTED THE WHEELS FROM SPINNING UP AND ACTIVATING THE ANTI-SKID. BRAKES COULD HAVE BEEN REGAINED IF THE ANTI-SKID WAS TURNED OFF.
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.