Wed, Oct 01, 2003
CASA AWB 26-1 Issue 1
Engine bleed air warning system installation in Beech turboprop
Effectivity: This Airworthiness Bulletin
relates to the bleed air warning system installed on Beech King Air
200, 300 and 350 series aircraft. However, other Beech turboprop
models using similar systems may also be affected.
Purpose: The purpose of this Airworthiness
Bulletin is to advise operators and maintainers that a possibility
of cross connecting the left and right bleed air warning system may
exist in Beech turboprop aircraft. A cross connected bleed air
warning system can lead the crew to mis-identify a bleed air duct
leak and isolate the wrong system.
measures: Maintenance manuals for Beech 200, 300 and 350
aircraft contain procedures to confirm correct operation of the
warning system on the ground by simulating a break in the EVA
tubing. This can be accomplished by disconnecting the tubing from
the bleed air pressure source during operation of the system. When
the left EVA tube is disconnected from the pressure source, the
left switch should activate and illuminate the L BL AIR FAIL
annunciator. Confirmation of the right system operation can
subsequently be accomplished by disconnecting the right tube from
the pressure source. The applicable aircraft maintenance manual
procedure should be followed for testing the system.
Recommendation: Because of the potential danger
associated with the incorrect detection of a failed bleed air
system - operators and maintainers are advised to:
- check for possible cross connection of the pressure switches in
the aircraft in accordance with the maintenance manual.
- be careful during maintenance so that the pressure switches are
not cross connected inadvertently.
Three-Eight Charlie If you know the name of the first woman to fly solo around the world, you’re ahead of most people. By the way, if you thought it was Amelia Earhart, you&r>[...]
Holding pattern. A racetrack pattern, involving two turns and two legs, used to keep an aircraft within a prescribed airspace with respect to a geographic fix.>[...]
“We need a world-class system of weather prediction in the United States – one, as the National Academy of Sciences recently put it, that is ‘second to none'." So>[...]
Send Them A Story -- We Don't Mind! Do you need another set of eyes to see that story you can't believe Jim just wrote? Want to spread Hognose's unique wisdom and perspective to th>[...]
Cites 'Strong Record On Aviation Security' The Association of Flight Attendants-CWA (AFA) has endorsed Congressman Ed Markey for the U.S. Senate, specifically noting his proven rec>[...]