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A B757-200 parked at gate has left engine thermal anti-ice pressure blow-off door pop open. Found cockpit thermal anti-ice switches were still in 'on' position.
| Attributes | |
| ACN | 703400 |
| Time | |
| Date | 200607 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : den.airport |
| State Reference | CO |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 160 flight time total : 9238 flight time type : 3867 |
| ASRS Report | 703400 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 75 flight time total : 13000 flight time type : 3000 |
| ASRS Report | 703398 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure non adherence : far |
| Independent Detector | other other : 3 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
During descent into den; engine anti-ice was turned on at approximately 17000 ft due to entering cloud layer and OAT. Flight attendants were seated due to turbulence. Upon breaking out of clouds; vectors and further descent were given by den approach; followed by runway assignment change to runway 34R. After passenger were deplaned; just prior to first officer performing exterior inspection for ensuing flight; a pop was heard on left side of aircraft. When I exited the jetway; a ground worker pointed to a piece of the left engine cowling that had apparently been punctured from the inside located on the upper forward portion of the cowling's inboard side. Maintenance was notified and determined that it was part of the tai (thermal anti-ice system) system. It was afterward noted that engine tai switches were still in the 'on' position.
Original NASA ASRS Text
Title: A B757-200 PARKED AT GATE HAS L ENG THERMAL ANTI-ICE PRESSURE BLOW-OFF DOOR POP OPEN. FOUND COCKPIT THERMAL ANTI-ICE SWITCHES WERE STILL IN 'ON' POS.
Narrative: DURING DSCNT INTO DEN; ENG ANTI-ICE WAS TURNED ON AT APPROX 17000 FT DUE TO ENTERING CLOUD LAYER AND OAT. FLT ATTENDANTS WERE SEATED DUE TO TURB. UPON BREAKING OUT OF CLOUDS; VECTORS AND FURTHER DSCNT WERE GIVEN BY DEN APCH; FOLLOWED BY RWY ASSIGNMENT CHANGE TO RWY 34R. AFTER PAX WERE DEPLANED; JUST PRIOR TO FO PERFORMING EXTERIOR INSPECTION FOR ENSUING FLT; A POP WAS HEARD ON L SIDE OF ACFT. WHEN I EXITED THE JETWAY; A GND WORKER POINTED TO A PIECE OF THE L ENG COWLING THAT HAD APPARENTLY BEEN PUNCTURED FROM THE INSIDE LOCATED ON THE UPPER FORWARD PORTION OF THE COWLING'S INBOARD SIDE. MAINT WAS NOTIFIED AND DETERMINED THAT IT WAS PART OF THE TAI (THERMAL ANTI-ICE SYS) SYS. IT WAS AFTERWARD NOTED THAT ENG TAI SWITCHES WERE STILL IN THE 'ON' POS.
Data retrieved from NASA's ASRS site as of January 2009 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.