If hydraulic propeller feathering systems are used for this purpose, the feathering lines must be at least fire resistant under the operating conditions that may be expected to exist during feathering.
(hydraulic propeller feathering systems; are used; for this purpose) (the feathering lines; must be; at least fire resistant under the operating conditions) (the operating conditions; may be expected; ) (the operating conditions; to exist; T:during feathering)
hydraulic propeller feathering systems the feathering lines the operating conditions the operating conditions
are used must be may be expected to exist
for this purpose
at least fire resistant under the operating conditions
T:during feathering