Aviation Mechanic - General, Airframe, and Powerplant › I. General › Task D. Fluid Lines and Fittings

AM.I.D.R5

Risk management

A twisted hose.

Study note

Get a short, cited explanation of this element written from the FAA handbooks: the core idea, the numbers that matter, common test traps, and a quick self-check.

From the FAA library

Aviation Maintenance Technician Handbook - General p. 9-21
Chapter 9: Fluid Lines & Fittings › Twisting
least two hose diameters from the end fittings. Avoid clamp locations that restrict or prevent hose flexure. Twisting Hoses must be installed without twisting to avoid possible rupture of the hose or loosening of the attaching nuts. Use of swivel ... connections at one or both ends relieve twist stresses. Twisting of the hose can be determined from the identification stripe running along its length. This stripe should not spiral around the hose. Figure 9-39. Reusable fittings for medium-pressure…
Aviation Maintenance Technician Handbook - Airframe p. 14-23
Chapter 14: Aircraft Fuel Systems › Fuel System Components › Fuel Lines & Fittings
twisting. The writing printed on the outside of the hose is used as a lay line to monitor fuel hose twist. Separation should be maintained between all fuel hoses and electrical wiring. Never clamp wires to a fuel line. When…
Aviation Maintenance Technician Handbook - General p. 9-16
Chapter 9: Fluid Lines & Fittings › Hose Identification
identifying the manufacturer. These markings are in contrasting colored letters and numerals that indicate the natural lay (no twist) of the hose and are repeated at intervals of not more than 9 inches along the length of the hose. Code…