 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
HS25 crew did not switch manually to high pressure pneumatic bleed before the engine was reduced to idle. This resulted in insufficient bleed air to operate the air conditioning and pressurization system.
| Attributes | |
| ACN | 419090 |
| Time | |
| Date | 199811 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : cmh |
| State Reference | OH |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 5000 flight time type : 100 |
| ASRS Report | 419090 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem flight crew : declared emergency other |
| Consequence | faa : investigated Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
I was the PF in the left seat. After departure the captain must have forgot to go to high pressure bleed air for pressurization. It is no big until descent. It is even on the after takeoff checklist, which he said was complete. Descending into cmh, when I pulled the power back, the cabin pressure began to run away on us. We went on oxygen, asked ATC for an immediate descent. After I told the captain to get out the checklist he realized he did not have the high pressure air on. After resolving the situation, the cabin was fine. We told ATC that we required no further assistance. I am writing this because the FAA has started inquiring to my company about this incident, which I had no control over. We took care and resolved the situation.
Original NASA ASRS Text
Title: HS25 CREW DID NOT SWITCH MANUALLY TO HIGH PRESSURE PNEUMATIC BLEED BEFORE THE ENG WAS REDUCED TO IDLE. THIS RESULTED IN INSUFFICIENT BLEED AIR TO OPERATE THE AIR CONDITIONING AND PRESSURIZATION SYS.
Narrative: I WAS THE PF IN THE L SEAT. AFTER DEP THE CAPT MUST HAVE FORGOT TO GO TO HIGH PRESSURE BLEED AIR FOR PRESSURIZATION. IT IS NO BIG UNTIL DSCNT. IT IS EVEN ON THE AFTER TKOF CHKLIST, WHICH HE SAID WAS COMPLETE. DSNDING INTO CMH, WHEN I PULLED THE PWR BACK, THE CABIN PRESSURE BEGAN TO RUN AWAY ON US. WE WENT ON OXYGEN, ASKED ATC FOR AN IMMEDIATE DSCNT. AFTER I TOLD THE CAPT TO GET OUT THE CHKLIST HE REALIZED HE DID NOT HAVE THE HIGH PRESSURE AIR ON. AFTER RESOLVING THE SIT, THE CABIN WAS FINE. WE TOLD ATC THAT WE REQUIRED NO FURTHER ASSISTANCE. I AM WRITING THIS BECAUSE THE FAA HAS STARTED INQUIRING TO MY COMPANY ABOUT THIS INCIDENT, WHICH I HAD NO CTL OVER. WE TOOK CARE AND RESOLVED THE SIT.
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.