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Flight crew experienced excess cabin altitude warning, propeller brake warning, and icing and declared an emergency and landed at the nearest suitable airport.
| Attributes | |
| ACN | 303389 |
| Time | |
| Date | 199504 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : pia |
| State Reference | IL |
| Altitude | msl bound lower : 21000 msl bound upper : 21000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 160 flight time total : 3100 flight time type : 700 |
| ASRS Report | 303389 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical inflight encounter : weather other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency flight crew : overcame equipment problem flight crew : took evasive action other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
While in level cruise at FL210, received master warnings on the cabin altitude warning for both the 'excess cabin altitude' and 'propeller brake' simultaneously. Confirmed cabin altitude above 10000 ft and climbing. The captain took control of the aircraft and called for the excess cabin altitude checklist. Captain then stated that he was descending. I called ATC and asked for lower. He responded, 'how low?' I replied 10000 ft and he cleared us to 10000 ft. I then completed the 'excess cabin altitude' checklist after I secured my oxygen mask, followed by the 'propeller brake unlock' checklist. During the descent we began to accrete ice and it continued while level at 10000 ft. We contacted company maintenance control and flight control and informed them of the situation. We then discussed safety related problems and decided to land at the nearest suitable airport, which was peoria.
Original NASA ASRS Text
Title: FLC EXPERIENCED EXCESS CABIN ALT WARNING, PROP BRAKE WARNING, AND ICING AND DECLARED AN EMER AND LANDED AT THE NEAREST SUITABLE ARPT.
Narrative: WHILE IN LEVEL CRUISE AT FL210, RECEIVED MASTER WARNINGS ON THE CABIN ALT WARNING FOR BOTH THE 'EXCESS CABIN ALT' AND 'PROP BRAKE' SIMULTANEOUSLY. CONFIRMED CABIN ALT ABOVE 10000 FT AND CLBING. THE CAPT TOOK CTL OF THE ACFT AND CALLED FOR THE EXCESS CABIN ALT CHKLIST. CAPT THEN STATED THAT HE WAS DSNDING. I CALLED ATC AND ASKED FOR LOWER. HE RESPONDED, 'HOW LOW?' I REPLIED 10000 FT AND HE CLRED US TO 10000 FT. I THEN COMPLETED THE 'EXCESS CABIN ALT' CHKLIST AFTER I SECURED MY OXYGEN MASK, FOLLOWED BY THE 'PROP BRAKE UNLOCK' CHKLIST. DURING THE DSCNT WE BEGAN TO ACCRETE ICE AND IT CONTINUED WHILE LEVEL AT 10000 FT. WE CONTACTED COMPANY MAINT CTL AND FLT CTL AND INFORMED THEM OF THE SIT. WE THEN DISCUSSED SAFETY RELATED PROBS AND DECIDED TO LAND AT THE NEAREST SUITABLE ARPT, WHICH WAS PEORIA.
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.