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ASN Wikibase Occurrence # 216679
Last updated: 10 April 2021
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Date:25-OCT-2018
Time:11:19
Type:Silhouette image of generic PAY2 model; specific model in this crash may look slightly different
Piper PA-31T Cheyenne
Owner/operator:Bulldog Flying Club Inc
Registration: N555PM
C/n / msn: 31T-7620028
Fatalities:Fatalities: 5 / Occupants: 5
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Atlantic Ocean, E of Charleston, SC -   United States of America
Phase: En route
Nature:Private
Departure airport:Andrews, SC (KPVT)
Destination airport:Governor's Harbour Airport (GHB/MYEM)
Investigating agency: NTSB
Narrative:
The two pilots and three passengers were conducting a cross-country flight over the ocean from South Carolina to the Bahamas. About 30 minutes into the flight, while climbing through 24,300 ft to 25,000 ft about 95 miles beyond the coast, the pilot made a garbled radio transmission indicating an emergency and intent to return. At the time of the transmission the airplane had drifted slightly right of course. The airplane then began a descent and returned on course. After the controller requested several times for the pilot to repeat the radio transmission, the pilot replied, "we're descending." About 15 seconds later, at an altitude of about 23,500 ft, the airplane turned sharply toward the left, and the descent rate increased to greater than 4,000 ft per minute, consistent with a loss of control. Attempts by the air traffic controller to clarify the nature of the emergency and the pilot's intentions were unsuccessful. About 1 minute after the sharp left turn and increased descent, the pilot again declared an emergency. No further communications were received. Search efforts coordinated by the U.S. Coast Guard observed an oil slick and some debris on the water in the vicinity of where the airplane was last observed via radar, however the debris was not identified or recovered. According to recorded weather information, a shallow layer favorable for light rime icing was present at 23,000 ft. However, because the airplane was not recovered, the investigation could not determine whether airframe icing or any other more-specific issues contributed to the loss of control.

One air traffic control communication audio recording intermittently captured the sound of an emergency locator transmitter (ELT) "homing" signal for about 45 minutes, beginning near the time of takeoff, and ending about 5 minutes after radar contact was lost. Due to the intermittent nature of the signal, and the duration of the recording, it could not be determined if the ELT signal had begun transmitting before or ceased transmitting after these times. Because ELT homing signals sound the same for all airplanes, the source could not be determined. However, the ELT sound was recorded by only the second of two geographic areas that the airplane flew through and began before the airplane arrived near either of those areas. Had the accident airplane's ELT been activated near the start of the flight, it is unlikely that it would be detected in the second area and not the first. Additionally, the intermittent nature of the ELT signal is more consistent with an ELT located on the ground, rather than an airborne activation. An airborne ELT is more likely to have a direct line-of-sight to one or more of the ground based receiving antennas, particularly at higher altitudes, resulting in more consistent reception.

The pilot's initial emergency and subsequent radio transmissions contained notably louder background noise compared to the previous transmissions. The source or reason for the for the increase in noise could not be determined.

Probable Cause: An in-flight loss of control, which resulted in an impact with water, for reasons that could not be determined because the airplane was not recovered.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20181025X55256&key=1
https://flightaware.com/live/flight/N555PM/history/20181025/1410Z/KPHH/KCHS

FAA register: https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N555PM%20

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 10 months
Download report: Final report
Location


Revision history:

Date/timeContributorUpdates
26-Oct-2018 04:54 gerard57 Added
26-Oct-2018 05:54 Geno Updated [Aircraft type, Registration, Cn, Operator, Location, Departure airport, Destination airport, Source, Narrative]
26-Oct-2018 09:27 RobertMB Updated [Aircraft type]
26-Oct-2018 09:36 Iceman 29 Updated [Source, Photo]
26-Oct-2018 12:16 Aerossurance Updated [Time, Location, Source]
26-Oct-2018 18:09 mike0372 Updated [Total occupants, Source]
28-Oct-2018 19:10 gerard57 Updated [Total fatalities, Other fatalities, Narrative]
01-Nov-2018 18:23 harro Updated [Operator, Departure airport]
15-Nov-2018 14:24 Aerossurance Updated [Location, Departure airport, Source, Embed code, Damage, Narrative]
01-Sep-2020 16:54 ASN Update Bot Updated [Time, Operator, Departure airport, Destination airport, Source, Narrative, Accident report, ]
01-Sep-2020 18:48 harro Updated [Departure airport, Source, Embed code, Narrative, Accident report, ]

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