Subject area D of 12
Fluid Lines and Fittings
5-10% of the A&P General test, about 3 to 6 of the 60 questions. The FAA's test standard lists 6 knowledge elements and 7 risk management elements for this area. Here is every one, plus sample questions to try.
What the FAA tests
From the aviation mechanic test standard, FAA-S-ACS-1.
Knowledge: what you must know
- AM.I.D.K1Tubing and hose materials, applications, sizes, and fittings.
- AM.I.D.K2Rigid line or flexible hose material identification.
- AM.I.D.K3Rigid line fabrication, installation, and inspection techniques/practices.
- AM.I.D.K4Flexible hose fabrication, installation, and inspection techniques/practices.
- AM.I.D.K5Importance of using a torque wrench when securing fluid hose and line fittings.
- AM.I.D.K6Use of torque seal or similar witness techniques after installing critical fluid hose and line fittings.
Risk management: hazards you must be able to spot and manage
- AM.I.D.R1System configuration prior to and during maintenance.
- AM.I.D.R2Use of required safety equipment.
- AM.I.D.R3Hazardous fluids.
- AM.I.D.R4High-pressure fluid systems.
- AM.I.D.R5A twisted hose.
- AM.I.D.R6A loosened fitting or a hose that has moved out of position.
- AM.I.D.R7Use of tools while applying torque to a fluid line.
Try a sample question
Fluid Lines and Fittings ยท AM.I.D.K4
You fabricate a replacement hose for a 1,500 psi hydraulic system using new hose material and serviceable reusable end fittings. Before installing it, to at least what pressure is it recommended that you test it?
Practice all of fluid lines and fittings
The full course has questions on every element listed here, with an explanation and FAA source for each.