Aircraft Accident Brief Ntsb/aab-02/01 (Pb2002-910401): Egypt Air Flight 990, Boeing 767-366er, Su-Gap - National Transportation Safety Board Page 133
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160 Reference
Egyptian Investigation Team Requests
Reason of request and current status
Action 18: ailerons
Refer to B.1 Appendix #13, Performance,
EIT repeats request for Boeing to study the behavior
behavior
Addendum #1
of the inboard and outboard ailerons using high-
speed data. EIT also requests the control surfaces
hinge moment at speeds near sonic speed as derived
from wind tunnel tests. EIT did not receive Boeing
answer yet.
Action 20: elevator failure
To acquire more precise information for the
Regarding Boeing failure scenario (Boeing report B-
scenario
possible mechanical failure. EIT did not receive
H200-17027-ASI, dated 4 August 2000, Explanation
Boeing answer yet.
of Two767 Elevator System
Characteristics Observed During Dual PCA Fault
Ground Testing)
Egyptian Investigation Team requests the following:
-
Explanation for the mismatch in the elevators/
Columns gearing ratio.
-
The reason for ignoring the three factors
inf1uencing the elevator surface def1ection
mentioned in Boeing relevant study, with regard
to Boeing study concerning Split Elevator
Failure Scenario (B-H200-16968.ASI.R1, dated
21 July 2000), and its impact on the study when
these factors are included.
-
Explanation for the variation in the left-to-right
elevator difference with regard to the Failure
Analysis Report
Action 21: elevator system
To support the analysis of possible mechanical
With regard to 767 Elevator System Friction and
friction and hysteresis
failure.
Hysteresis (Boeing report B·H200-17028-ASI, dated
7August 2000), EIT requests Boeing to provide a
Boeing presented the letter “767 elevator control
study showing the impact of the conclusion in the
friction and Hysteresis “ B-H200-17028-ASI
dated 7-Aug-2000
above mentioned report on its failure analysis report.
Action 22: elevator
To support the analysis of possible mechanical
EIT requests the tabular data (e-file) that supports
response with power On
failure. EIT did not receive Boeing answer yet.
Boeing letter concerning elevator system response to
hydraulic power On (letter B-H200-17076-ASI)
Action 23: elevator failure
To establish the match criteria between the
EIT requests documentation of the expected
scenario
analytically predicted results and the FDR data.
tolerances of the analytically-developed elevator
EIT did not receive Boeing answer yet.
traces for the dual PCA valve jam scenario and a
comparison of these tolerances with the tolerances
of the FDR elevator traces.
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