Pilgrim Airlines Flight 458

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Pilgrim Airlines Flight 458
Wreckage of Pilgrim Airlines Flight 458.jpg
Wreckage of the aircraft
Accident
DateFebruary 21, 1982 (1982-02-21)
Summary In-flight fire due to defective windshield washer/deicing system
Site Scituate Reservoir, Scituate, near Providence, Rhode Island, U.S.
Aircraft
De Havilland DHC-6 (Twin Otter) N127PM at Logan Airport May 1975.jpg
The aircraft involved in the accident in a previous livery.
Aircraft type De Havilland Canada DHC-6-100 Twin Otter
Operator Pilgrim Airlines
IATA flight No.PM458
ICAO flight No.PMT458
Call signPILGRIM 458
Registration N127PM
Flight origin LaGuardia Airport, New York City, New York, U.S.
1st stopover Igor I. Sikorsky Memorial Airport, Stratford, Connecticut, U.S.
2nd stopover Tweed New Haven Airport, New Haven, Connecticut, U.S.
3rd stopover Groton–New London Airport, Groton, Connecticut, U.S.
Destination Logan International Airport, Boston, Massachusetts, U.S.
Occupants12
Passengers10
Crew2
Fatalities1
Injuries11
Survivors11

Pilgrim Airlines Flight 458 was a scheduled United States passenger air commuter flight from LaGuardia Airport in New York City to Logan Airport in Boston, Massachusetts, with stopovers in Bridgeport, New Haven, and Groton, Connecticut. On February 21, 1982, the de Havilland Canada DHC-6-100 operating the flight made a forced landing on the frozen Scituate Reservoir near Providence, Rhode Island, after a fire erupted in the cockpit and cabin due to leakage of flammable windshield washer/deicing fluid. One passenger was unable to escape the aircraft and died of smoke inhalation, and eight of the remaining nine passengers, as well as both crew members, received serious injuries from the fire and crash-landing. [1] [2] [3] [4] [5]

Contents

Accident

The three legs of the flight from LaGuardia to Groton were uneventful. At Groton, the flight crew who had flown the first three legs handed off the aircraft to the flight crew for the final Groton-Boston leg, and flight 458 took off from Groton at 1510 Eastern Standard Time. About 15 minutes later, while flying over northwestern Rhode Island, 27-year-old First Officer Lyle Hogg, [6] observing light icing on the windshield, activated the windshield washer/deicer system [a] twice, to little apparent effect; during the second deicing attempt, Hogg smelled alcohol, which prompted him to stop the deicing. [b] Shortly afterwards, smoke started entering the cockpit around the base of the control column. [1] [2] [c] 36-year-old Captain Thomas Prinster, [6] contacted air traffic control, declared an emergency, and requested and received radar vectors direct to T. F. Green Airport for an emergency landing; the airport's ARFF crews were called up to assist the aircraft upon its arrival. [2] [7] The smoke in the cockpit rapidly thickened to the point that the pilots could not see their cockpit instruments or each other and had to open their side windows for visibility and air, [2] [3] [4] [7] [8] [9] and fire broke out in the cockpit and forward cabin as the aircraft descended from its cruising altitude of 4,000 feet (1,200 m), badly burning Prinster, Hogg, and (to a lesser degree) two passengers who attempted unsuccessfully to extinguish the cabin fire; [2] [3] [4] surviving passengers described the fire in the cabin as "roll[ing]" or being like a "flaming river". [1] [d] The heat of the fire melted the flight crew's audio headsets, forcing them to be discarded. [2] [3] [8] During the emergency descent, one of the two passengers who attempted to fight the cabin fire, off-duty USAir flight engineer Harry Polychron, used a tennis racket to break cabin windows to try and clear smoke from the passenger cabin. [1] [3] [4]

Distribution of wreckage from Flight 458 at the scene of the forced landing. Pilgrim Airlines 458 wreckage chart.png
Distribution of wreckage from Flight 458 at the scene of the forced landing.

At approximately 1533, unable to reach T. F. Green Airport in time, Captain Prinster made a forced landing on the foot-thick ice of the western arm of Scituate Reservoir, 12.5 miles (10.9 nmi; 20.1 km) west-northwest of the airport, with the right wing and left main landing gear breaking off upon impact. [1] [7] [9] The flight crew and nine of the ten passengers managed to evacuate the burning aircraft and walk to shore (the tenth, a 59-year-old woman with severe chronic obstructive pulmonary disease and marked atherosclerosis, was overcome by smoke and toxic gas before she could escape). Of the eleven survivors, all but one sustained serious injuries in the accident; most of the passengers received blunt-force injuries of varying severity in the hard landing, the flight crew and two passengers were burned by the inflight fire (Captain Prinster received second-to-third-degree burns over 50 to 70 percent of his body surface and spent months in hospital, but ultimately survived; [9] [4] First Officer Hogg, although also suffering second-to-third-degree burns, was burned less extensively, due both to his wearing thicker clothing and to the fire being concentrated on the left side of the aircraft; and the two burned passengers sustained first-and-second-degree burns to their hands and arms), and all of the survivors suffered from smoke inhalation. [1] [2] [3] [7] [8] [10] The aircraft's fuselage was almost completely destroyed by fire after the landing, with the only surviving parts of the passenger cabin being the stainless-steel seat frames [e] and melted lower-fuselage structure. [1] [5]

Investigation and aftermath

Due to the fire breaking out immediately after the attempts to deice the windshield, the alcohol smell detected by the first officer just before the smoke started to appear, and the liquid, flowing nature of the fire in the passenger cabin, the National Transportation Safety Board (NTSB)'s investigation focused on the windshield washer/deicer system. [1] [2] [f] This system consisted of a polyethylene reservoir holding up to 1.5 US gal (5.7 L; 1.2 imp gal) of isopropyl alcohol, an electric pump, and nozzles to spray the alcohol onto the windshield, with Tygon tubing running from the reservoir to the pump and from the pump to the spray nozzles. The accident aircraft's washer/deicer had a history of leakage resulting from the Tygon tubing's incompatibility with isopropyl alcohol, exposure to which caused the ends of the tubing to become hardened and misshapen; the degraded tubing ends no longer fit tightly to their attachment points, and could sometimes separate completely. To fix this leakage, maintenance personnel had to periodically cut off the hardened, misshapen ends of the tubing and reattach the newly-shortened tubing (eventually shortening the tubing enough to require that more tubing be spliced on in order for the tubing to reach its attachment points without stretching). The procedures used by Pilgrim Airlines (and approved by de Havilland) at the time of the accident allowed the tubing to be secured to its attachment points by wrapping the connections with safety wire, and did not require the use of a clamp to hold the connection in place. [1]

Several months prior to the accident, while on the ground at LaGuardia, the tubing on the accident aircraft's washer/deicer system was found to have separated from the pump outlet; this occurred again just three days before the accident, when a pilot observed alcohol leaking from the pump outlet fitting, from which the tubing had separated, during a stopover in New Haven. [1] [9] The washer/deicer was repaired later that day, but the methods routinely used to secure the Tygon tubing did not positively ensure that it would stay attached to the pump and reservoir. [1] Postaccident testing using an exemplar pump, reservoir, and tubing [g] showed that, with the pump outlet disconnected from its tubing, a slow leak from the pump would occur even with the pump not operating. If the pump was activated without the tubing being connected to its outlet, it would spray liquid forward for up to 7 feet (2.1 m); in its installed position in the aircraft, this would spray flammable isopropyl alcohol throughout the compartment under the cockpit floor, an area which contained numerous possible ignition sources. [1] [2] [9] [h] The NTSB considered the alcohol washer/deicer system to pose a serious fire hazard, and recommended its removal from the DHC-6s which used it; [1] [11] [12] the Federal Aviation Administration agreed, and issued an Airworthiness Directive in December 1982 which prohibited the system from being used for deicing past November 30, 1983 (eliminating the use of highly-flammable isopropyl alcohol in the system), and required the installation of an electrically-heated windshield for DHC-6s certified to be flown in icing conditions after that date. [12] [13]

For their work in flying the aircraft to a successful landing despite the extremely hostile cockpit environment, and thereby saving the lives of nearly everyone on board, Captain Prinster and First Officer Hogg were jointly awarded the Flight Safety Foundation's Heroism Award for 1982. [3] [9] [14] Additionally, a public park in Scituate was named after, and dedicated to, the pilots of Flight 458. [7] [9] [15] Both pilots eventually returned to flying with Pilgrim Airlines, although for Prinster this lasted only briefly before he retired from commercial aviation; he died in 2018 due to lingering complications of lung damage from the Flight 458 fire. [8] [10] Hogg moved to US Airways in 1984 and eventually became that airline's vice president of flight operations, before serving as president and CEO of Piedmont Airlines from 2015 through 2020. [16] [17] In November 2019, Prinster and Hogg were both inducted into the Rhode Island Aviation Hall of Fame (Prinster posthumously) for their heroic actions. [10] [17]

Dramatization

The crash was featured in season 24, episode 6, of the Canadian documentary series Mayday, titled "Fight for Survival". [18]

Notes

  1. ↑ This system, which sprayed isopropyl alcohol onto the windshield to clean it and melt ice, was one of two windshield deicing systems available for the DHC-6 at the time, the other option being an electrically-heated windshield; installation of one or the other system was required for DHC-6s to be operated in icing conditions. At the time of the accident, fewer than one out of every eleven DHC-6s in the global fleet (70 out of 780) were equipped with the alcohol washer/deicer system; of the remaining 710 DHC-6s, the NTSB report does not mention how many were equipped with the electrically-heated windshield, and how many had neither system installed (and were, thus, not equipped for operation in icing conditions). [1]
  2. ↑ Four of the surviving passengers also noticed an alcohol or chemical smell before the fire broke out. [1]
  3. ↑ The DHC-6 has a Y-shaped control column that comes up through a single opening in the cockpit floor (with the pilots' control wheels mounted at the ends of the arms of the Y), rather than (as with most aircraft with dual pilot positions) having two separate control columns in front of the captain's and first officer's seats.
  4. ↑ The aircraft had two fire extinguishers on board, one mounted on the rear bulkhead of the cockpit behind First Officer Hogg's seat and one underneath the rearmost seat on the left side of the passenger cabin, but the cockpit extinguisher was too hot to handle and the cabin extinguisher was not visible when its seat was occupied (and would have been difficult to access even for an occupant who was aware of it). [1] [3] [5]
  5. ↑ Stainless steel has a far higher melting point than the aluminum alloys used for the aircraft's primary structure.
  6. ↑ Pilgrim Airlines removed the washer/deicer system from all their DHC-6s two days after the accident.
  7. ↑ The washer/deicer system from the accident aircraft was, with the exception of a partially-melted piece of the reservoir, completely destroyed by fire, and was, therefore, unavailable for testing.
  8. ↑ The exact ignition source could not be determined, as there were several different possibilities and this area of the aircraft – as with most of the fuselage – was gutted by fire after landing.

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References

PD-icon.svg This article incorporates public domain material from websites or documents of the National Transportation Safety Board .

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 "Pilgrim Airlines Flight 458, deHavilland DHC-6-100, N127PM, Near Providence, Rhode Island, February 21, 1982" (PDF). National Transportation Safety Board. July 20, 1982. Archived from the original (PDF) on August 4, 2021. Retrieved August 4, 2021.
  2. 1 2 3 4 5 6 7 8 9 Leo Caisse (July 21, 2020). "Miracle on Scituate Reservoir: The Pilgrim Airlines Fiery Emergency Landing". New England Historical Society. Archived from the original on August 6, 2021. Retrieved August 5, 2021.
  3. 1 2 3 4 5 6 7 8 "'I couldn't sit there and cook like that again'". United Press International . August 21, 1982. Archived from the original on August 6, 2021. Retrieved August 5, 2021.
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  5. 1 2 3 "'Investigators face problems in airplane fire'". United Press International . February 23, 1982. Archived from the original on January 22, 2022. Retrieved January 22, 2022.
  6. 1 2 "Fight for Survival". Mayday. Season 24. Episode 6. 2024. Discovery Channel Canada / National Geographic Channel.
  7. 1 2 3 4 5 Jim Ignasher (July 23, 2020). "Ablaze Over The Scituate Reservoir". Smithfield Times. Archived from the original on October 3, 2021. Retrieved October 3, 2021– via Smith-Appleby House Museum & The Historical Society of Smithfield.
  8. 1 2 3 4 Brian Amaral (August 31, 2018). "Pilot who pull off 1982 miracle on Scituate Reservoir dies". The Providence Journal . Archived from the original on August 6, 2021. Retrieved August 6, 2021.
  9. 1 2 3 4 5 6 7 Ignasher, Jim (2010). "A FIRE ABOARD FLIGHT 458 - 1982". Rhode Island Disasters: Tales of Tragedy by Air, Sea and Rail. The History Press. ISBN   978-1-61423-280-3. Archived from the original on October 3, 2021. Retrieved October 3, 2021.
  10. 1 2 3 Duffy Hayes (December 19, 2019). "Grand Junction native Tom Prinster survived terrifying 1982 plane crash". Grand Junction Daily Sentinel. Archived from the original on August 6, 2021. Retrieved August 6, 2021.
  11. ↑ "SAFETY RECOMMENDATION(S) A-82-56 and -57" (PDF). National Transportation Safety Board. Archived from the original (PDF) on August 8, 2021. Retrieved August 7, 2021.
  12. 1 2 "Safety Recommendation A-82-056". National Transportation Safety Board . Retrieved August 7, 2021.
  13. ↑ "AIRWORTHINESS DIRECTIVES FINAL RULES: 82-26-06". Federal Aviation Administration . Retrieved August 7, 2021.
  14. ↑ "FSF Heroism Award". Flight Safety Foundation. Archived from the original on August 6, 2021. Retrieved August 5, 2021.
  15. ↑ "Prinster-Hogg Park – Scituate, R.I." New England Aviation History. April 26, 2015. Archived from the original on August 6, 2021. Retrieved August 6, 2021.
  16. ↑ "Eric Morgan Appointed Chief Executive Officer of Piedmont Airlines". Piedmont Airlines. November 23, 2020. Archived from the original on August 6, 2021. Retrieved August 6, 2021.
  17. 1 2 "Newsroom - Piedmont CEO honored for lifesaving efforts". American Airlines. November 26, 2019. Archived from the original on August 6, 2021. Retrieved August 6, 2021.
  18. ↑ "National Geographic - Air Crash Investigation". National Geographic. Retrieved January 8, 2024.
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