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Light transport experiences a serious aircraft equipment problem and gets lower altitude only by emergency declared.
| Attributes | |
| ACN | 217513 |
| Time | |
| Date | 199208 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bgm |
| State Reference | NY |
| Altitude | msl bound lower : 10000 msl bound upper : 30000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 12300 |
| ASRS Report | 217513 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 150 flight time total : 5500 |
| ASRS Report | 217512 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Climbing through FL300, the cockpit became very hot. The crew was unable to control the hot air mixing valve. The cockpit became extremely hot. Smoke started pouring into the cockpit. The captain turned off the flow control valve which shut off the hot air and smoke. This valve also opened the outflow valve which evacuated the smoke. The cabin altitude began to rise and the captain asked center for lower altitude 3 times and center did not clear the aircraft to lower altitude. The WX was VMC, so the captain declared an emergency and executed an emergency descent. The crew proceeded back to the departure airport at 10000 ft unpressurized and executed a normal approach and landing. Supplemental information from acn 217512. Cockpit temperature gauge was climbing and was not ctlable by either automatic or manual control. We got a duct overheat light but no normal loss of temperature that should follow this light illuminating. About 28-30000 ft the heat was becoming uncontrollable and we noticed some smoke in the cockpit. The captain was flying and we agreed he would continue to do so as well as communicate while I tried to find a checklist to meet the problem -- no appropriate checklist was found so I placed a phone call to our maintenance facility but they were unable to provide any assistance. The captain was trying to get lower, but center was unable so we turned the cabin air switch off to vent the cabin and started a necessary descent to try to control cabin altitude and smoke. It was necessary to declare an emergency in order to get lower. We then returned to elm for maintenance.
Original NASA ASRS Text
Title: LTT EXPERIENCES A SERIOUS ACFT EQUIP PROBLEM AND GETS LOWER ALT ONLY BY EMER DECLARED.
Narrative: CLBING THROUGH FL300, THE COCKPIT BECAME VERY HOT. THE CREW WAS UNABLE TO CTL THE HOT AIR MIXING VALVE. THE COCKPIT BECAME EXTREMELY HOT. SMOKE STARTED POURING INTO THE COCKPIT. THE CAPT TURNED OFF THE FLOW CTL VALVE WHICH SHUT OFF THE HOT AIR AND SMOKE. THIS VALVE ALSO OPENED THE OUTFLOW VALVE WHICH EVACUATED THE SMOKE. THE CABIN ALT BEGAN TO RISE AND THE CAPT ASKED CTR FOR LOWER ALT 3 TIMES AND CTR DID NOT CLR THE ACFT TO LOWER ALT. THE WX WAS VMC, SO THE CAPT DECLARED AN EMER AND EXECUTED AN EMER DSCNT. THE CREW PROCEEDED BACK TO THE DEP ARPT AT 10000 FT UNPRESSURIZED AND EXECUTED A NORMAL APCH AND LNDG. SUPPLEMENTAL INFO FROM ACN 217512. COCKPIT TEMP GAUGE WAS CLBING AND WAS NOT CTLABLE BY EITHER AUTO OR MANUAL CTL. WE GOT A DUCT OVERHEAT LIGHT BUT NO NORMAL LOSS OF TEMP THAT SHOULD FOLLOW THIS LIGHT ILLUMINATING. ABOUT 28-30000 FT THE HEAT WAS BECOMING UNCTLABLE AND WE NOTICED SOME SMOKE IN THE COCKPIT. THE CAPT WAS FLYING AND WE AGREED HE WOULD CONTINUE TO DO SO AS WELL AS COMMUNICATE WHILE I TRIED TO FIND A CHKLIST TO MEET THE PROBLEM -- NO APPROPRIATE CHKLIST WAS FOUND SO I PLACED A PHONE CALL TO OUR MAINT FACILITY BUT THEY WERE UNABLE TO PROVIDE ANY ASSISTANCE. THE CAPT WAS TRYING TO GET LOWER, BUT CTR WAS UNABLE SO WE TURNED THE CABIN AIR SWITCH OFF TO VENT THE CABIN AND STARTED A NECESSARY DSCNT TO TRY TO CTL CABIN ALT AND SMOKE. IT WAS NECESSARY TO DECLARE AN EMER IN ORDER TO GET LOWER. WE THEN RETURNED TO ELM FOR MAINT.
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.