An EMB145 on approach at 6000 ft declared an emergency. Crew was unable to extend the trailing edge ...

Attributes
ACN	423235
Time
Date	199812
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : tri
State Reference	TN
Altitude	msl bound lower : 6000 msl bound upper : 6000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Embraer Undifferentiated or Other Model
Navigation In Use	Other
Flight Phase	landing other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 200 flight time total : 10900 flight time type : 320
ASRS Report	423235
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

While being vectored for an ILS approach, flaps were set to 9 degrees. Flap failure message came on, followed by a flap low speed message on EICAS. We verified the flaps were inoperative by the flap indicator remaining at zero. I then advised ATC we were having a problem with our flaps and requested to hold over the OM. We then performed the zero flap landing checklist. It required multiplying the unfactored landing distance by 1.33. I contacted our dispatcher via radio and asked him to figure our landing distance for zero flaps wet runway. After obtaining the landing distance, we determined the runway of 8000 ft was adequate for landing. As a precaution, we requested to have the crash fire rescue equipment equipment standing by. I made the ILS to a no flap landing without incident. Callback conversation with reporter revealed the following information: the reporter stated the flap extend problem was caused by a failed flap drive transmission. The failed transmission caused an asymmetrical shutoff. The analyst inquired if the reporter had any experiences or was familiar with any elevator or horizontal stabilizer tail vibrations or shudder and the reporter stated in the affirmative. The reporter said that hand flying the airplane at high speed in a climbing turn, vibrations are felt but not in the yoke. The reporter stated the air carrier operates 3 aircraft and all have experienced this vibration. The reporter said one aircraft had the elevator replaced and rerigged, but is not aware if it was a positive fix.

Original NASA ASRS Text

Title: AN EMB145 ON APCH AT 6000 FT DECLARED AN EMER. CREW WAS UNABLE TO EXTEND THE TRAILING EDGE FLAPS CAUSED BY A FAILED FLAP DRIVE XMISSION, AND MADE A NO FLAP LNDG.

Narrative: WHILE BEING VECTORED FOR AN ILS APCH, FLAPS WERE SET TO 9 DEGS. FLAP FAILURE MESSAGE CAME ON, FOLLOWED BY A FLAP LOW SPD MESSAGE ON EICAS. WE VERIFIED THE FLAPS WERE INOP BY THE FLAP INDICATOR REMAINING AT ZERO. I THEN ADVISED ATC WE WERE HAVING A PROB WITH OUR FLAPS AND REQUESTED TO HOLD OVER THE OM. WE THEN PERFORMED THE ZERO FLAP LNDG CHKLIST. IT REQUIRED MULTIPLYING THE UNFACTORED LNDG DISTANCE BY 1.33. I CONTACTED OUR DISPATCHER VIA RADIO AND ASKED HIM TO FIGURE OUR LNDG DISTANCE FOR ZERO FLAPS WET RWY. AFTER OBTAINING THE LNDG DISTANCE, WE DETERMINED THE RWY OF 8000 FT WAS ADEQUATE FOR LNDG. AS A PRECAUTION, WE REQUESTED TO HAVE THE CFR EQUIP STANDING BY. I MADE THE ILS TO A NO FLAP LNDG WITHOUT INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FLAP EXTEND PROB WAS CAUSED BY A FAILED FLAP DRIVE XMISSION. THE FAILED XMISSION CAUSED AN ASYMMETRICAL SHUTOFF. THE ANALYST INQUIRED IF THE RPTR HAD ANY EXPERIENCES OR WAS FAMILIAR WITH ANY ELEVATOR OR HORIZ STABILIZER TAIL VIBRATIONS OR SHUDDER AND THE RPTR STATED IN THE AFFIRMATIVE. THE RPTR SAID THAT HAND FLYING THE AIRPLANE AT HIGH SPD IN A CLBING TURN, VIBRATIONS ARE FELT BUT NOT IN THE YOKE. THE RPTR STATED THE ACR OPERATES 3 ACFT AND ALL HAVE EXPERIENCED THIS VIBRATION. THE RPTR SAID ONE ACFT HAD THE ELEVATOR REPLACED AND RERIGGED, BUT IS NOT AWARE IF IT WAS A POSITIVE FIX.

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.

An EMB145 on approach at 6000 ft declared an emergency. Crew was unable to extend the trailing edge flaps caused by a failed flap drive transmission, and made a no flap landing.