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Takeoff aborted when airspeed and other instrument readouts don't add up with aircraft about to lift off runway.
| Attributes | |
| ACN | 259891 |
| Time | |
| Date | 199312 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : phl |
| State Reference | PA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | climbout : takeoff other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 182 flight time total : 6797 flight time type : 1170 |
| ASRS Report | 259891 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 270 flight time total : 4500 flight time type : 1450 |
| ASRS Report | 259700 |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : rejected takeoff |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
The captain called for the first officer to initiate an aborted takeoff due to erroneous airspeed and altitude indications. The aircraft was returned to the gate, the passenger deplaned and a post-flight accomplished. 3 pitot tube covers were still in place. The original preflight was accomplished by the first officer, but was segmented due to extreme cold and wind chill. It was the first time this first officer had seen intake and exhaust covers installed which he removed and stowed. Those covers were orange and had flags attached. The pitot tube covers were small, black and had no flags or streamers attached. There was no mention of propeller ties or cold WX gear being installed in the logbook. This incident could have been prevented by a thorough preflight by the first officer. Contributing factors were: 1) extreme cold and wind chill segmenting the preflight. 2) discovering and stowing cold WX gear that was found during preflight interrupting normal flow. 3) no flags/streamers or red/orange color of pitot tube covers. 4) no logbook entries of cold WX gear being installed. 5) lack of familiarity of pitot tube covers, intake and exhaust covers. Recommendations will be made through the safety rep to: 1) incorporate familiarity with all cold WX gear in initial ground training. 2) install flags/streamers on pitot tube covers (or at least color them red or orange). 3) ensure proper logbook entries are made when cold WX gear is installed on aircraft. Supplemental information from acn 259700: the plane had been sitting for 48 hours and all protective covering had been put on aircraft. The aircraft felt normal but the airspeed indicated slow acceleration. Also the altimeter started a slow descent. I glanced quickly at the first officer's and the standby instruments to see if they indicated a problem, and could not tell. The aircraft then started trying to get airborne with the airspeed still showing about 40 KTS below V1.
Original NASA ASRS Text
Title: TKOF ABORTED WHEN AIRSPD AND OTHER INST READOUTS DON'T ADD UP WITH ACFT ABOUT TO LIFT OFF RWY.
Narrative: THE CAPT CALLED FOR THE FO TO INITIATE AN ABORTED TKOF DUE TO ERRONEOUS AIRSPD AND ALT INDICATIONS. THE ACFT WAS RETURNED TO THE GATE, THE PAX DEPLANED AND A POST-FLT ACCOMPLISHED. 3 PITOT TUBE COVERS WERE STILL IN PLACE. THE ORIGINAL PREFLT WAS ACCOMPLISHED BY THE FO, BUT WAS SEGMENTED DUE TO EXTREME COLD AND WIND CHILL. IT WAS THE FIRST TIME THIS FO HAD SEEN INTAKE AND EXHAUST COVERS INSTALLED WHICH HE REMOVED AND STOWED. THOSE COVERS WERE ORANGE AND HAD FLAGS ATTACHED. THE PITOT TUBE COVERS WERE SMALL, BLACK AND HAD NO FLAGS OR STREAMERS ATTACHED. THERE WAS NO MENTION OF PROP TIES OR COLD WX GEAR BEING INSTALLED IN THE LOGBOOK. THIS INCIDENT COULD HAVE BEEN PREVENTED BY A THOROUGH PREFLT BY THE FO. CONTRIBUTING FACTORS WERE: 1) EXTREME COLD AND WIND CHILL SEGMENTING THE PREFLT. 2) DISCOVERING AND STOWING COLD WX GEAR THAT WAS FOUND DURING PREFLT INTERRUPTING NORMAL FLOW. 3) NO FLAGS/STREAMERS OR RED/ORANGE COLOR OF PITOT TUBE COVERS. 4) NO LOGBOOK ENTRIES OF COLD WX GEAR BEING INSTALLED. 5) LACK OF FAMILIARITY OF PITOT TUBE COVERS, INTAKE AND EXHAUST COVERS. RECOMMENDATIONS WILL BE MADE THROUGH THE SAFETY REP TO: 1) INCORPORATE FAMILIARITY WITH ALL COLD WX GEAR IN INITIAL GND TRAINING. 2) INSTALL FLAGS/STREAMERS ON PITOT TUBE COVERS (OR AT LEAST COLOR THEM RED OR ORANGE). 3) ENSURE PROPER LOGBOOK ENTRIES ARE MADE WHEN COLD WX GEAR IS INSTALLED ON ACFT. SUPPLEMENTAL INFORMATION FROM ACN 259700: THE PLANE HAD BEEN SITTING FOR 48 HRS AND ALL PROTECTIVE COVERING HAD BEEN PUT ON ACFT. THE ACFT FELT NORMAL BUT THE AIRSPD INDICATED SLOW ACCELERATION. ALSO THE ALTIMETER STARTED A SLOW DSCNT. I GLANCED QUICKLY AT THE FO'S AND THE STANDBY INSTS TO SEE IF THEY INDICATED A PROB, AND COULD NOT TELL. THE ACFT THEN STARTED TRYING TO GET AIRBORNE WITH THE AIRSPD STILL SHOWING ABOUT 40 KTS BELOW V1.
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.