 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Potential conflict occurs when an MD80 flight crew loses partial and temporary control of their aircraft when descending in turbulence near mlu, la.
| Attributes | |
| ACN | 575150 |
| Time | |
| Date | 200302 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zob.artcc |
| State Reference | OH |
| Altitude | msl bound lower : 4000 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc tower : cle.tower |
| Operator | general aviation : personal |
| Make Model Name | M-20 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : multi engine pilot : private pilot : commercial |
| Experience | flight time last 90 days : 90 flight time total : 180 flight time type : 800 |
| ASRS Report | 575161 |
| Person 2 | |
| Affiliation | other |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : improper documentation non adherence : far other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact none taken : anomaly accepted |
| Factors | |
| Maintenance | performance deficiency : logbook entry performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Began encountering intermittent moderate chop at FL280. Requested a descent and made a PA for the flight attendants to take their seats. Seatbelt sign was already on. Leveled off at FL260. After a couple of mins, began to experience moderate chop. Requested a descent to FL240. Was given clearance to FL250 till clear of traffic at FL240. Autoplt went to altitude capture at FL252, and throttles began to move forward. Encountered moderate turbulence and noticed altitude at FL248 and rapidly descending. Took over manually and stopped descent. Altitude stopped at FL246. TCASII sounded 2 'TA's.' traffic appeared to be about 2 O'clock position, 5-6 NM and FL240. Still in moderate turbulence, aircraft began climbing rapidly through FL250. Stopped climb at FL260. ZFW called at this time to ask if we were at FL246. Advised center we were at FL260 descending to FL250. Told center we had descended to FL246 and then aircraft had rapidly climbed to FL260. Leveled off at FL250 till cleared to FL240, then continued descent to FL240. Advised ZFW of the situation and asked if they needed any more information. Checked with flight attendants and was told they had all been in their seats and everyone in back was ok. Sent in position report over ACARS reporting moderate turbulence over mlu at FL250. Contacted ZFW after the flight, and was told they placed us at FL246, 3-4 NM from traffic at FL240. Contacted dispatch and notified them of near miss and altitude deviation. We were IMC during the entire incident. WX radar was on -- turbulence mode selected -- not painting any returns except ground returns.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT OCCURS WHEN AN MD80 FLT CREW LOSES PARTIAL AND TEMPORARY CTL OF THEIR ACFT WHEN DSNDING IN TURB NEAR MLU, LA.
Narrative: BEGAN ENCOUNTERING INTERMITTENT MODERATE CHOP AT FL280. REQUESTED A DSCNT AND MADE A PA FOR THE FLT ATTENDANTS TO TAKE THEIR SEATS. SEATBELT SIGN WAS ALREADY ON. LEVELED OFF AT FL260. AFTER A COUPLE OF MINS, BEGAN TO EXPERIENCE MODERATE CHOP. REQUESTED A DSCNT TO FL240. WAS GIVEN CLRNC TO FL250 TILL CLR OF TFC AT FL240. AUTOPLT WENT TO ALT CAPTURE AT FL252, AND THROTTLES BEGAN TO MOVE FORWARD. ENCOUNTERED MODERATE TURB AND NOTICED ALT AT FL248 AND RAPIDLY DSNDING. TOOK OVER MANUALLY AND STOPPED DSCNT. ALT STOPPED AT FL246. TCASII SOUNDED 2 'TA'S.' TFC APPEARED TO BE ABOUT 2 O'CLOCK POS, 5-6 NM AND FL240. STILL IN MODERATE TURB, ACFT BEGAN CLBING RAPIDLY THROUGH FL250. STOPPED CLB AT FL260. ZFW CALLED AT THIS TIME TO ASK IF WE WERE AT FL246. ADVISED CTR WE WERE AT FL260 DSNDING TO FL250. TOLD CTR WE HAD DSNDED TO FL246 AND THEN ACFT HAD RAPIDLY CLBED TO FL260. LEVELED OFF AT FL250 TILL CLRED TO FL240, THEN CONTINUED DSCNT TO FL240. ADVISED ZFW OF THE SIT AND ASKED IF THEY NEEDED ANY MORE INFO. CHKED WITH FLT ATTENDANTS AND WAS TOLD THEY HAD ALL BEEN IN THEIR SEATS AND EVERYONE IN BACK WAS OK. SENT IN POS RPT OVER ACARS RPTING MODERATE TURB OVER MLU AT FL250. CONTACTED ZFW AFTER THE FLT, AND WAS TOLD THEY PLACED US AT FL246, 3-4 NM FROM TFC AT FL240. CONTACTED DISPATCH AND NOTIFIED THEM OF NEAR MISS AND ALTDEV. WE WERE IMC DURING THE ENTIRE INCIDENT. WX RADAR WAS ON -- TURB MODE SELECTED -- NOT PAINTING ANY RETURNS EXCEPT GND RETURNS.
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.