Aircraft Accident Brief Ntsb/aab-02/01 (Pb2002-910401): Egypt Air Flight 990, Boeing 767-366er, Su-Gap - National Transportation Safety Board Page 128
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160 1. Requests submitted directly to NTSB
Reference
Egyptian Investigation Team Requests
Reason of request and current status
Exhibit 9- Systems
Elevator Hardware
EIT asked for more studies and data to explain the
To support the analysis of the anomalies observed
examination and analysis.
abnormalities that were found in one of the right
with one of the recovered PCA’s.
elevator power control actuators. EIT showed its
disagreement with delivered Boeing study. (EIT
Status: Boeing provided two letters:
comments has been officially submitted to NTSB
-
Dynamic Analysis right PCA B-200-17066-
on June 29, 2000)
ASI, 29-Sep-00
-
Dynamic Analysis right PCA B-200-17066-
ASI, 20-Oct-00
These studies are still considered to be
incomplete.
EIT requested recovery of the following
To acquire more data to support the investigation
components:
analysis
•
RAT (Ram Air Turbine).
•
QAR (Quick Access Recorder).
•
Non of the requested component has been
The elevator remaining surfaces.
•
recovered yet.
One elevator input bellcrank.
•
The following flight control actuators:
§ Two elevator power control actuators
(PCA).
§ One elevator autopilot servo actuator.
§ Two outboard aileron actuators.
§ Two outboard spoiler actuators.
§ One inboard aileron actuator.
Only the inboard aileron actuator was recovered
during the second wreckage recovery effort, March
2000.
Boeing letter, “Split
EIT requested an answer from Boeing regarding the
To validate Boeing analysis of the “Split Elevator
Elevator Failure Scenario”
discrepancies between the Ground Test results and
Failure Scenario”.
dated July 21, 2000.
Boeing analysis for the elevator PCA’s failure.
(EIT request has been officially submitted to NTSB
Boeing presented the following letters:
on June15, 2000)
767 elevator control System Operation with
Regard to Column Splits, Aft quadrant splits, and
column jam B-H200-17026-ASI, B-H200-17026-
ASI-R1, B-H200-17083-ASI-R1, dated 2-Aug-
00, 14-Sep-00 and 20-Oct-00 respectively
-
Explanation of two 767 elevator system
Characteristics observed during dual PCA
Fault ground testing, B-H200-17027-ASI,
dated 4 Aug-00.
-
767 Elevator control friction and hysteresis,
B-H200-17028-ASI dated 7-Aug-00
EIT commented about these letters during the
Boeing Meeting, Nov 2000.
EIT requested:
To visualize the cockpit indication during the dive,
•
and to support investigating pressurization system
Additional information regarding ADC/ IRS
11
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