Old 1st Jan 2019, 11:11
  #1 (permalink)  
Join Date: Oct 2007
Location: Here and there
Posts: 316
Jet transport dead stick landings after loss of all engines in heavy rain and hail

https://www.ntsb.gov/investigations/...ts/AAR7803.pdf Well worth re-visiting. Old accident but little has changed in terms of procedural advice to operators. DC9 into a severe thunderstorm. Loss of both engines due heavy rain and hail ingestion. Pilot error in throttle handling. Forced landing attempted on a road. Fatal.

On 4 April 1977, a US registered DC-9 forced landed on a highway after loss of both engines in a thunderstorm. Many of todays pilots reading this accident report would not have been born by then. Yet the circumstances of the accident and lessons learned apply just as much today as all those years ago. The CVR reading was invaluable to the investigators. While the length of the NTSB report may put off those who prefer a shorter version via IPhone this scribe nevertheless recommends study of the complete report to gain full professional value.Some edited extracts may help.

For example: The feet of a number of survivors was cut and some were burned because they had no shoes for protection. The FA had briefed the passengers to remove their shoes to prevent damage to the evacuation slides.

Para. 1.17.1 discusses in depth the glide ratio of the DC-9 assuming double flameout.

Para. 1.17.3 discusses the limitations of aircraft weather radar in heavy rain. Severe rainfall within the antenna field (100 feet) disperses the beam with consequent reduction of radar performance. In several cases all targets disappear and an indistinct haze may appear at the indicator origin.

Paragraph 2.1.1. Engine failure and flight crew reaction. Regarding the dual engine failure with no thrust available to correct flight path misjudgements. Consequently, instruction and practice are required to develop these skills and the flight crew never received or were they required to receive any instruction of practice in emergency landings with all engines inoperative. Moreover, the approved operating manuals contained no guidance or procedure on the subject.

Para. 3.2. Loss of thrust was cause by the ingestion of massive amounts of water and hail which in combination with thrust lever movement induced severe stall in and major damage to the engine compressors. Similar circumstances to a Garuda Indonesia Boeing 737-300 on 16 January 2002. Penetrated a severe thunderstorm and experienced a flameout of both engines in heavy rainfall followed by total electrical failure. At the time the weather radar was ineffective in heavy rain. The aircraft was ditched flapless. See: https://en.wikipedia.org/wiki/1975_T...t_C-5_accident
Judd is offline