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A CL65 departing yyz, on, has a rapid depressurization due to aircraft damage. Aircraft returned to land at yyz.
| Attributes | |
| ACN | 392013 |
| Time | |
| Date | 199801 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : yyz |
| State Reference | ON |
| Altitude | msl bound lower : 6000 msl bound upper : 6500 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : yyz |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger CL604 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : sid |
| 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 : 8000 flight time type : 1500 |
| ASRS Report | 392013 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : cfi |
| ASRS Report | 392335 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : unable other |
| Consequence | other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Arrived at aircraft which had been parked on the ramp overnight. First officer performed the external preflight with no reported discrepancies. Prior to taxi, the ramp personnel asked us to move the aircraft slightly under power as they could not remove the chocks. Taxi to the runway was normal (uneventful). After takeoff at gear retraction the air noise seemed louder than normal, but quieted after the gear was retracted and the aircraft was pressurizing normally. Climbing through 6000 ft we experienced a loud thud and a lot of air noise. The pressure indications showed that the aircraft was depressurizing at about 1500 FPM. We leveled at our cleared altitude and declared an emergency returning to yyz. Upon inspection of the aircraft at the gate, a gash about 18 inches long and 6 inches wide at its widest was noted. This was located about 2-3 inches aft and slightly above the right nose gear door. There was no indication that we hit anything in-flight and it is possible that the aircraft was damaged by ground equipment while parked overnight. If this was the case the damage was missed on the preflight. The area was not easy to see under the aircraft. It was night. The left side of the aircraft was well lighted, the right side in shadow. If this did happen, the damage caused was probably much less noticeable than what we saw subsequently as the aircraft did initially prescribe and I think the damage was extended in-flight.
Original NASA ASRS Text
Title: A CL65 DEPARTING YYZ, ON, HAS A RAPID DEPRESSURIZATION DUE TO ACFT DAMAGE. ACFT RETURNED TO LAND AT YYZ.
Narrative: ARRIVED AT ACFT WHICH HAD BEEN PARKED ON THE RAMP OVERNIGHT. FO PERFORMED THE EXTERNAL PREFLT WITH NO RPTED DISCREPANCIES. PRIOR TO TAXI, THE RAMP PERSONNEL ASKED US TO MOVE THE ACFT SLIGHTLY UNDER PWR AS THEY COULD NOT REMOVE THE CHOCKS. TAXI TO THE RWY WAS NORMAL (UNEVENTFUL). AFTER TKOF AT GEAR RETRACTION THE AIR NOISE SEEMED LOUDER THAN NORMAL, BUT QUIETED AFTER THE GEAR WAS RETRACTED AND THE ACFT WAS PRESSURIZING NORMALLY. CLBING THROUGH 6000 FT WE EXPERIENCED A LOUD THUD AND A LOT OF AIR NOISE. THE PRESSURE INDICATIONS SHOWED THAT THE ACFT WAS DEPRESSURIZING AT ABOUT 1500 FPM. WE LEVELED AT OUR CLRED ALT AND DECLARED AN EMER RETURNING TO YYZ. UPON INSPECTION OF THE ACFT AT THE GATE, A GASH ABOUT 18 INCHES LONG AND 6 INCHES WIDE AT ITS WIDEST WAS NOTED. THIS WAS LOCATED ABOUT 2-3 INCHES AFT AND SLIGHTLY ABOVE THE R NOSE GEAR DOOR. THERE WAS NO INDICATION THAT WE HIT ANYTHING INFLT AND IT IS POSSIBLE THAT THE ACFT WAS DAMAGED BY GND EQUIP WHILE PARKED OVERNIGHT. IF THIS WAS THE CASE THE DAMAGE WAS MISSED ON THE PREFLT. THE AREA WAS NOT EASY TO SEE UNDER THE ACFT. IT WAS NIGHT. THE L SIDE OF THE ACFT WAS WELL LIGHTED, THE R SIDE IN SHADOW. IF THIS DID HAPPEN, THE DAMAGE CAUSED WAS PROBABLY MUCH LESS NOTICEABLE THAN WHAT WE SAW SUBSEQUENTLY AS THE ACFT DID INITIALLY PRESCRIBE AND I THINK THE DAMAGE WAS EXTENDED INFLT.
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.