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Rev: A SIL-04577-35-001
Date: August 14, 2008 Page 1 of 5
SERVICE INFORMATION LETTER (SIL)
Field Inspection / Test Procedures
Carleton P/N B43902 Series
Riser Line Shutoff Valves
OXYGEN – ATA CHAPTER 35 CAGE CODE: 04577
A. SUBJECT
The purpose of this SIL is to provide supplemental information to Operators regarding the
Inspection / Test criteria, the interchangeability of and the notification of B/E Aerospace as the
new engineering authority for Carleton P/Ns B43902-1 and B43902-3 Riser Line Shutoff Valves.
Background
The Shut Off Valve, Riser Line is installed in each of the riser lines in the engine burst
area for stopping flow in a defined direction. The valve must close if a rupture of a riser
line anywhere downstream of the valve results in a differential pressure exceeding the
specified value. Once closed, the valve shall remain closed until the pressure differential
across the valve has fallen to below 0.9 bard (approximately 13 psid). After the pressure
differential across the valve has fallen to below a specified value, the valve shall re-open.
Rev: A SIL-04577-35-001
Date: August 14, 2008 Page 2 of 5
Background (cont.)
Amendment “A” - Testing revealed the orifice lubricant, ChristoLube MCG111, to be
unsatisfactory. To improve valve performance, this lubricant was replaced by Krytox
240AC. Following the change of O-Ring lubricant to Krytox 240AC and re-identification
of the Riser Line Shutoff Valve (RLSOV) as part number B43902-1, Amendment A,
additional testing was conducted and further design improvements were made.
Amendment “AB” - A change was made to the finish on the inlet and outlet mating
surfaces of the valve. This change specified removal of the anodize finish on the inlet
and outlet mating surfaces and application of chemical conversion coating (alodine) to
the surfaces. In addition, the internal probe was re-designed as a one-piece component
in place of the previous three-piece design. The component label was changed to
B43902-1 Amendment AB to reflect the mating surface treatment and probe design
changes.
Amendment “AB” White Dot - During ground testing of Amendment AB units at the
system level, it was discovered that some valves did not re-open following an extended
pressurization cycle. In response to the reported anomaly, the Acceptance Test
Procedure (ATP) was revised to specify an extended pressurization cycle test time of 1
hour (nearly double the interval used in the system ground test), followed by a re-opening
test. In addition to the revised ATP, a design improvement was made to reduce internal
friction of the RLSOV’s moving orifice. The change consisted of modification to the ORing
grooves on the orifice, part number B43973-1, to reduce the O-Ring squeeze and
thereby reduce friction. Shutoff valves having the “AB” changes and reduced O-Ring
squeeze successfully passed the re-opening test.
Part Number B43902-3 - At the customer’s request, the improvements described in the
preceding paragraphs were incorporated into the manufacturing process. Identified as
part number, B43902-3, this configuration represents the latest design evolution of the
Shut Off Valve, Riser Line.
Description
The Riser Line Shutoff Valves are part of the low pressure oxygen distribution section in
the designated “engine burst zone” of the aircraft. The valve is designed to protect the
system from loss of pressure due to leakage from a severed riser line.
The Shutoff Valve-Riser L senses differential pressure across the orifice and closes
quickly to seal off a riser line if a downstream line is severed. The valve may be thought
of as a “flow fuse.” The valve permits the maximum flow of oxygen required by a riser
line if the emergency passenger oxygen system is in use between altitudes of 15000 to
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