Aircraft Accident Brief Ntsb/aab-02/01 (Pb2002-910401): Egypt Air Flight 990, Boeing 767-366er, Su-Gap - National Transportation Safety Board Page 129
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160 Reference
Egyptian Investigation Team Requests
Reason of request and current status
•
additional information regarding the effect of
EIT did not receive Boeing response. Items are
aircraft high rate of descent on the operation of
still opened.
the pressure controllers.
(EIT request has been submitted to Boeing through
an E-mail on July 14, 2000 with a copy to the
NTSB, on July 21, 2000)
Exhibit 13 Aircraft
Performance
Group Chairman’s
The EIT asked for some more studies relevant to
To support the performance analysis and the
Performance Study.
accident and not included in the performance study
study of possible aircraft disintegration.
(when, where and why engine separation occurred,
radar interference study, …)
The NTSB presented Aircraft Performance
Addendum #4, “Engine separation study”, dated
03 April 01, and revised version on April
09,2001.
EIT disagrees with the study conclusion
Group Chairman’s
EIT asked the NTSB to apply the same
To support the analysis for the split elevator
Performance Study.
methodology used for the elevator split study on the
movement at the end of the dive.
Addendum # 1
Aileron split (Study has been made by the EIT)
EIT did not receive NTSB answer
Boeing presented the letters:
-
Aileron Behavior, B-H200-17216-ASI, dated
12 April 2001.
-
Elevator Behavior, B-H200-17219-ASI,
dated 16 April 2001.
These letters contain descriptive information
without any analysis.
EIT requested to conduct wind tunnel tests to
To investigate the abnormal behavior of the
examine the ailerons and elevators behavior at
ailerons and elevators during the dive
speeds near the sonic speed
EIT received some incomplete data during
(EIT request has been officially submitted to NTSB
Boeing presentation in Cairo, May 2001.
on June 22, 2000)
Exhibit # 12 Cockpit Voice
Recorder
Sound Spectrum study
EIT asked the NTSB to:
To support the analysis for identifying the
Record the cockpit door operation and the cooling
unknown sounds in the cockpit before and during
pack switches sounds during a flight test at an
the dive.
altitude of 33000 ft
(EIT request has been officially submitted to NTSB
EIT did not receive NTSB answer yet
on May 2000 and August 11, 2000)
Do proper spectrum study for the word
To identify the persons occupying the cockpit
“Control It” and the following sounds. (Egyptian
before and during the dive.
Civil Aviation submission August, 2000)
EIT did not receive NTSB answer yet
Exhibit # 3 ATC
The following requests have been made to the
To support identifying the radar returns that were
FAA and assistant secretary of state for answers to
observed in the vicinity of EgyptAir 990 before
questions that continue to be critical to the
beginning of the dive.
12
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