Category: navion, carburator, hose, exhaust
Applicability: Serial numbers NAV-4-2 Through NAV-4-1790.
Supersedes: n/a
Compliance: As soon as possible, by September 1, 1950
Procedure: The above
aircraft employ flexible hose, Ryan Drawing 145-42202, between the exhaust
shroud and the carburetor heat valve. This hose
has shown a tendency to deteriorate with age and may
collapse, resulting in a considerable loss of engine power. An inspection
of these hoses should be made not later than March 20, 1950, and after
each 25 hours of aircraft operation until replacement is made with the
hose mentioned below. All hoses found to be in poor condition should be
replaced immediately by wire reinforced hose. Arrowhead Rubber Co. hose
type 8AX (Ryan Drawing No. 145-42202- 3) or equivalent is satisfactory.
Notes: Ryan Service Letter No. 67 dated February 7, 1950, also covers this subject.
AD-50-10-02