Originally posted by johnlear
I was wrong!
In double checking with my sources for my post on the circuit breaker for the overspeed warning in the Boeing 757/767 I found out that I was wrong.
In fact there is a circuit breaker for the aural warning. On the Boeing 757 it is on Panel P-11 and it is either B16 or H35. One of those is the
overspeed warning and one is the cabin altitude.
Please accept my apologies for the misinformation I have posted on the overspeed warning. There is in fact a circuit breaker that can disable the
overspeed warning.
Well not totally John...
Here is a Airworthiness Directive from 2004 that suggests there are 7567-200s out there that do not have the C/B yet
Airworthiness Directives; Boeing Model 747-400, 747-400D, 747-
400F, 757-200, 757-200PF, 757-200CB, 767-200, 767-300, and 767-300F
Series Airplanes
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule.
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SUMMARY: This amendment adopts a new airworthiness directive (AD),
applicable to certain Boeing transport category airplane models, as
listed above. This amendment requires a modification of the air data
computer (ADC) system, which involves
installing certain new circuit
breakers, relays, and related components, and making various wiring
changes in and between the flight deck and main equipment center. For
certain airplanes, this amendment also requires accomplishment of
various other actions prior to or concurrently with the modification of
the ADC system. For certain airplanes, this amendment also contains an
option that will extend the compliance time to accomplish the
modification of the ADC system.
This action is necessary to ensure that
the flightcrew is able to silence an erroneous overspeed or stall aural
warning. A persistent erroneous warning could confuse and distract the
flightcrew and lead to an increase in the flightcrew's workload. Such a
situation could lead the flightcrew to act on hazardously misleading
information, which could result in loss of control of the airplane.
This action is intended to address the identified unsafe condition.
DATES: Effective June 22, 2004.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of June 22, 2004.
[edit on 25-9-2007 by Xtrozero]