Extra 200 - Page 127

CHAPTER 20
PAGE 10
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RA - FLUGZEUGBAU GmbH
SERVICE MANUAL EXTRA 200
PAGE DATE: 1. July 1996
20-10-07 Flexible Hose
The EXTRA 200 is equipped for the oil, fuel, and brake
lines with "AEROQUIP-hoses Aerospace Division". From
Serial No. 3 equivalent "STRATOFLEX-hoses Aerospace
Connectors Division" are used. Later, from Serial No. 22
KNAPP hoses are used for the brake system in the cockpit
area and for the flight instruments. Maintenance work or
overhaul of these hoses requires the attention of the manu-
facturer informations and bulletins. For the replacement of
hose and hose assemblies the EXTRA-Flugzeugbau GmbH
should be contacted.
Replacement of Flexible Hose
Hose and hose assemblies should be checked for deteriora-
tion at each inspection period. Leakage, separation of the
cover or braid from the inner tube, cracks, hardening, lack
of flexibility, and excessive "cold flow" are apparent sign
of deterioration and reason for replacement. The term "cold
flow" describes the deep, permanent impressions in the
hose produced by pressure of hose clamps or supports.
The entire assembly must be replaced, if failure occurs in
a flexible hose before the time limit (refer to Chapter 05-10-
02 Overhaul Schedule) of the hose is achieved. Obtain a
new hose assembly of the correct size and length, complete
with factory-installed end fittings.
Installation of Flexible Hose Assemblies
The flexible hose must not be twisted on installation, since
this reduces the life of the hose considerably and may
loosen the fittings. Twisting of the hose can be determined
from the identification stripe running along its length.
The minimum bend radius for flexible hose varies accord-
ing to size and construction of the hose and the pressure
under which the hose is to operate. Bends that are too sharp
will reduce the bursting pressure of flexible hose consider-
ably below its rated value.
ST
ANDARD PRACTICES AIRFRAME
PAGE DATE: 15. December 1999