MIL-HDBK 1028/6A
a)
One 8 in. motorized shutoff valve,
b)
One service selector switch in NEMA 1 enclosure,
c)
One wall-mounted hose rack, and
d) One 75 ft (23 m) length of 8 in. insulated flexible duct
(aircraft connections are Government-furnished equipment).
8.1.4
Preconditioned Air Equipment Components (Alternate).
Preconditioned air service drop from secondary coils shall extend from
secondary coils down fire wall near compressed air apparatus and under the
deck in polyvinyl chloride (PVC) conduit to service pit mounted flush with
deck (1 in. drainage runoff lip) near center of hangar or aircraft service
point. Ductwork installed below deck shall be high-pressure preinsulated
flexible duct. The end 10 ft (3.05 m) section shall be spring-loaded,
self-storing type to assist replacement in pit after use. Each service
point shall have the following:
a)
One 8 in. motorized shutoff valve (at fire wall),
b) One service selector switch in NEMA 1 enclosure
(at fire wall),
c) One length as required 8 in. high-pressure preinsulated
flexible duct,
d) One 10 ft (3.05 m) length, 8 in. high-pressure preinsulated
flexible duct, spring-loaded type,
e) One length as required 10 in. (254 mm) PVC conduit with long
radius sweep-type elbows and 2 in. drainage tap at low point,
f) One elastomeric boot seal to connect metal duct drop to
flexible duct and conduit, and
g) One fiberglass service pit with cast aluminum removable pit
cover and access door for preconditioned air duct. (Aircraft coupler is
Government-furnished equipment.)
The PVC conduit for the underground flexible duct shall have
provision for drainage which shall be collected in common drain header and
routed to plumbing sanitary or storm sewer as required by local code.
8.1.5
Electrical System Components.
Service points shall contain
60 Hz and 400 Hz components as follows.
8.1.5.1
60 Hz Components.
The 60 Hz components shall consist of:
48
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