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Engine Starts with Outside Air Temperature (OAT) at 40°C / 104°F or Greater
GOT-9
Flight Crew Operations Manual Bulletin
for
Gol Linhas Aereas S.A.
Number:
GOT
-
9 R1
IssueDate:
November 17, 2018
Subject:
Engine Starts with Outside Air Temperature (OAT) at 40°C / 104°F or
Greater
Reason:
To provide flight crews alternate engine start procedures in an effort to
avoid a potential EGT exceedance when OAT is 40°C / 104°F or greater.
This bulletin is being revised to remove the requirement to ensure the
ELECTRIC HYDRAULIC PUMP switches are ON in order to start
engines during pushback. This revision aligns bulletin guidance with
existing normal procedures. Service Bulletin information is also being
provided.
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
During certification for the 737-8, analysis was conducted for engine ground
starts on cold engines and in hot ambient conditions. A cold engine is an engine
with indicated EGT of 74°C or less. Analysis showed that engine starts
conducted on cold engines and when the OAT was 47°C / 117°F or greater, the
EGT start limit could often be reached before a successful engine start is
achieved. Exceeding the EGT would require an Aborted Engine Start. The
likelihood of exceeding the EGT start limit during the start attempt is related to
the fuel schedule used by the EEC when the engine core temperature is near the
ambient temperature.
Information in this bulletin is recommended by The Boeing Company, but may not be FAA approved
at the time of writing. In the event of conflict with the FAA approved Airplane Flight Manual
(AFM), the AFM shall supersede. The Boeing Company regards the information or procedures
described herein as having a direct or indirect bearing on the safe operation of this model airplane.
March 1, 2021