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GENERAL INFORMATION CIRCULAR
Form No. IGO/E&M/GIC/No.31/ISSUE 01
Subject: Opening Of Fan Cowl Doors GIC No. 03 of 2012
Date : 30/05/12 Status : Informatory Effective : Forthwith
Purpose : To highlight the correct procedure for opening the fan
cowl doors.
DESCRIPTION:
The fan cowl doors have sandwich construction of carbon fiber
composite, an aluminum honeycomb core and a layer
of copper mesh. The doors are latched together along the bottom
center line by four adjustable tension hook latches.
If the fan cowl doors are pulled open by using front or aft
latches, it leads to alignment pin of the fan cowl door
getting stuck in alignment fittings on air intake cowl. This
induces a bending stress on the fan cowl door. This stress
will potentially lead to delamination of the area around the
alignment pin on the fan cowl door (Refer Appendix I for
the photographs of the affected areas).
Therefore, it is recommended that the fan cowl doors should be
pulled open by using the center latches to avoid any
bending or rotational load on the fan cowl doors.
G.L.Gupta
Dy. G.M Engg. (LMM)
Raised By Date Effectivity Authorized by
PARICHAY DATTA 30/05/12 FORTHWITH V.P. ENGG.
