Thu, Mar 16, 2006
Applicability:
Model GIV-X series aeroplanes, serial numbers (S/N) 4001 and
subsequent; and Gulfstream Model GV-SP series aeroplanes, S/N 5001
and subsequent; on which Gulfstream Modification ASC-904 or
production equivalent has been incorporated.
Requirement: Revise the Limitations Section of
the Gulfstream G350, G450, G500 and G550 Aircraft Flight Manuals
(AFM) by including the applicable revision listed in Table 1 of
this Directive.
Any further revisions to the AFM must contain the identical
procedures in the Limitations Section of the AFM revisions as
required by this Directive.
Compliance: Within 10 days after the effective
date of this Directive.
This Airworthiness Directive becomes effective on 22 March
2006.
Background:
The United States Federal Aviation Administration has received a
report indicating that all four of the cockpit flight panel display
units simultaneously went blank during flight on a Gulfstream Model
GV-SP aeroplane. The displays did not recover until the flightcrew
pulled circuit breakers associated with the displays; subsequently,
three of the four displays returned to normal. Initial
investigation revealed discrepancies with the reversion logic of
the advanced graphic modules. Similar display failures occurred
during ground test operations. Such conditions, if not corrected,
could result in a reduction of the flightcrew's situational
awareness and possible loss of control of the aeroplane.
This Directive requires the revision of the Limitations section
of the AFM by incorporating new procedures to follow in the event
that the cockpit displays go blank or malfunction. The amendment of
AFM is an interim measure and further rulemaking to correct the
discrepancy is anticipated.
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