 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B737-300 air carrier flight crew discovers on post flight inspection that both engine's fan sections had blade tip damage, apparently from icing. The forward cowling of the cfm-56-3C engines is deiced, but the nose dome is not. Both engines were replaced. Icing was not forecast.
| Attributes | |
| ACN | 357274 |
| Time | |
| Date | 199612 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : als |
| State Reference | CO |
| Altitude | msl bound lower : 22000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 10320 flight time type : 3600 |
| ASRS Report | 357274 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 17000 flight time type : 7000 |
| ASRS Report | 357025 |
| Events | |
| Anomaly | aircraft equipment problem : critical inflight encounter : weather other anomaly other |
| Independent Detector | other flight crewa other other : unspecified |
| Resolutory Action | flight crew : exited adverse environment none taken : detected after the fact |
| Consequence | other Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | other |
Narrative:
We arrived at the aircraft and were informed by the previous crew that all altitudes above FL240 were extremely turbulent. Preflight and departure were normal. When handed off to ZDV we asked and were given FL240 for a final altitude. As we crossed the mountain range south of pueblo we began to experience light and occasionally moderate turbulence. ZDV confirmed reports that all altitudes above FL240 were extremely turbulent, but FL220 had been reported as good. We requested and received clearance to FL220. As we descended we turned on both engine and wing anti-ice system. Overwing illumination lights were turned on and we made several visual scans to make sure no ice accumulation had developed. Initially at FL220 we experienced light turbulence, but the controller said it was regional and as we continued south of alamosa it would get better. We then heard a 'thump' on the aircraft and immediately requested a climb. We ended at FL260 and later FL280, both of which were comfortable rides. Approach and landing in phoenix were normal, but postflt revealed damage to compressor blades and both engines. There had been no reports of icing at any altitude either from WX services or ATC. In the future we will use caution when receiving advisories from other crews and ATC. WX patterns can move quickly and change rapidly.
Original NASA ASRS Text
Title: B737-300 ACR FLC DISCOVERS ON POST FLT INSPECTION THAT BOTH ENG'S FAN SECTIONS HAD BLADE TIP DAMAGE, APPARENTLY FROM ICING. THE FORWARD COWLING OF THE CFM-56-3C ENGS IS DEICED, BUT THE NOSE DOME IS NOT. BOTH ENGS WERE REPLACED. ICING WAS NOT FORECAST.
Narrative: WE ARRIVED AT THE ACFT AND WERE INFORMED BY THE PREVIOUS CREW THAT ALL ALTS ABOVE FL240 WERE EXTREMELY TURBULENT. PREFLT AND DEP WERE NORMAL. WHEN HANDED OFF TO ZDV WE ASKED AND WERE GIVEN FL240 FOR A FINAL ALT. AS WE CROSSED THE MOUNTAIN RANGE S OF PUEBLO WE BEGAN TO EXPERIENCE LIGHT AND OCCASIONALLY MODERATE TURB. ZDV CONFIRMED RPTS THAT ALL ALTS ABOVE FL240 WERE EXTREMELY TURBULENT, BUT FL220 HAD BEEN RPTED AS GOOD. WE REQUESTED AND RECEIVED CLRNC TO FL220. AS WE DSNDED WE TURNED ON BOTH ENG AND WING ANTI-ICE SYS. OVERWING ILLUMINATION LIGHTS WERE TURNED ON AND WE MADE SEVERAL VISUAL SCANS TO MAKE SURE NO ICE ACCUMULATION HAD DEVELOPED. INITIALLY AT FL220 WE EXPERIENCED LIGHT TURB, BUT THE CTLR SAID IT WAS REGIONAL AND AS WE CONTINUED S OF ALAMOSA IT WOULD GET BETTER. WE THEN HEARD A 'THUMP' ON THE ACFT AND IMMEDIATELY REQUESTED A CLB. WE ENDED AT FL260 AND LATER FL280, BOTH OF WHICH WERE COMFORTABLE RIDES. APCH AND LNDG IN PHOENIX WERE NORMAL, BUT POSTFLT REVEALED DAMAGE TO COMPRESSOR BLADES AND BOTH ENGS. THERE HAD BEEN NO RPTS OF ICING AT ANY ALT EITHER FROM WX SVCS OR ATC. IN THE FUTURE WE WILL USE CAUTION WHEN RECEIVING ADVISORIES FROM OTHER CREWS AND ATC. WX PATTERNS CAN MOVE QUICKLY AND CHANGE RAPIDLY.
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.