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Figure 2 DFDR etc. data
Deff. Press.(psi)
Alt.(feet)
Deff. Press.
Aircraft Alt.
Cabin Alt.
Detected Time of Safety Valves Open
24
Aft Pressure Bulkhead
Safety Valves
Figure 3 Installed Position of Safety Valves
Figure 4 Cross-Sectional View of Safety Valve
Servo Chamber Servo Chamber Cabin Chamber Gate Control Valve
Setscrew Internal Bore Stem, Poppet Diaphragm
Sensing Hole for Cabin Pressure Sensing Bore for Ambient Pressure
Poppet Valve Airhole in Central Screw Air Filter
Ambient Pressure
Aft Pressure Bulkhead
Cabin pressure FWD
25
Stem Asembly
Seat Asembly
Bushing
eat
Stem Poppet
Stem Spring
Stem Guide
Shim
Set Screw
Diaphragm
Spring
Cover of Control Valve
Figure 5 Internal Structure of Safety Valve
Figure 6 Cross-Sectional View of Control Valve
The Whole of Control Valve
Shim
The length from the cover
to the tip of a adjusting
screw Stem Assembly
Cross-Sectional View of Stem Assembly
Stem Poppet
The contacting surface between
Stem Poppet and Seat Assembly
Stem Spring
Seat Assembly
Bush
Stem Guide
Cover, Sensor
Spring A Spring B
27
Figure 7 Description of photographed points
An arrow shows below the direction with fault observed under the microscope
inspection about each part.
Photo4
Photo5
Photo7 Photo6
Photo3
28
Photograph 2 Safety Valves outside cabin
Photograph 1 Safety Valves front side
Aft pressure bulkhead
(back side)
Gate
SN129
29
Photograph 3 Inside Stem, Poppet
Photograph 4 Inside Stem, Poppet
The bush hole in which the stem poppet slides was found to be worn
Several burrs were found on the edge of a drill hole
30
Photograph 5 Inside Stem, Poppet
Contamination
Photograph 6 Inside Stem, Poppet
Scratch
31
Photograph 7 Inside Stem, Poppet
Particle
P&WC Safety Management System
For International Helicopter Safety Symposium
30 September 2009 / Montreal
P&WC PROPRIETARY INFORMATION 2
OUTLINE
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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