AMS 117 Unit 5 Exam Questions and
Answers
Question 1
What are the steps for presetting MS flare-less fittings?
Correct Answer
1. lubricate coupling nut and sleeve
2. slide nut and sleeve onto tube
3. seat tube end square against shoulder inside presetting tool
4. screw nut onto presetting tool by hand
5. complete final tightening with wrench
Question 2
cover used for low and medium pressure hose assembly:
Correct Answer
Integral heat resistant silicon sleeve
Question 3
What is copper/brass tubing used for?
Correct Answer
very soft, used for oxygen system servicing lines and some instrument lines (very
small typically)
Question 4
MIL-H-8794:
Correct Answer
medium pressure hose, 1 carbon steel wire reinforcement
Page 1 of 21
,Question 5
What does the reinforcement layer do in a flexible hose?
Correct Answer
determines strength and pressure capacity
Question 6
Tube threads:
Correct Answer
Tube (machine) threads are standard straight threads
Question 7
What is tube beading?
Correct Answer
This process produces a raised ridge around the tube near the end for connecting a
flexible hose to a tube without fittings
Question 8
What does the outer cover do in a flexible hose?
Correct Answer
provides abrasion, chemical and thermal protection
Question 9
What size tube is a .180-4?
Correct Answer
.180 = .035" wall thickness
-4 = 1/4" outside diameter
Page 2 of 21
, Question 10
What improves grounding on plain and padded clamps?
Correct Answer
bonding clamps must have all paint and anodizing removed from the clamp
location to improve grounding
Question 11
CRES is sometimes used for low or medium pressure when greater abrasion damage
or corrosion protection is needed, as on landing gear systems.
True or False?
Correct Answer
True
Question 12
How are tubes sized?
Correct Answer
Outside diameter and wall thickness
Question 13
Purpose of the sleeve:
Correct Answer
Provides support to the flare on the tubing
Question 14
What does eliminating the flare on an MS fitting do?
Correct Answer
makes it simpler and easier to work with
provides safe and strong connection
can withstand more vibration before leaking
Page 3 of 21
Answers
Question 1
What are the steps for presetting MS flare-less fittings?
Correct Answer
1. lubricate coupling nut and sleeve
2. slide nut and sleeve onto tube
3. seat tube end square against shoulder inside presetting tool
4. screw nut onto presetting tool by hand
5. complete final tightening with wrench
Question 2
cover used for low and medium pressure hose assembly:
Correct Answer
Integral heat resistant silicon sleeve
Question 3
What is copper/brass tubing used for?
Correct Answer
very soft, used for oxygen system servicing lines and some instrument lines (very
small typically)
Question 4
MIL-H-8794:
Correct Answer
medium pressure hose, 1 carbon steel wire reinforcement
Page 1 of 21
,Question 5
What does the reinforcement layer do in a flexible hose?
Correct Answer
determines strength and pressure capacity
Question 6
Tube threads:
Correct Answer
Tube (machine) threads are standard straight threads
Question 7
What is tube beading?
Correct Answer
This process produces a raised ridge around the tube near the end for connecting a
flexible hose to a tube without fittings
Question 8
What does the outer cover do in a flexible hose?
Correct Answer
provides abrasion, chemical and thermal protection
Question 9
What size tube is a .180-4?
Correct Answer
.180 = .035" wall thickness
-4 = 1/4" outside diameter
Page 2 of 21
, Question 10
What improves grounding on plain and padded clamps?
Correct Answer
bonding clamps must have all paint and anodizing removed from the clamp
location to improve grounding
Question 11
CRES is sometimes used for low or medium pressure when greater abrasion damage
or corrosion protection is needed, as on landing gear systems.
True or False?
Correct Answer
True
Question 12
How are tubes sized?
Correct Answer
Outside diameter and wall thickness
Question 13
Purpose of the sleeve:
Correct Answer
Provides support to the flare on the tubing
Question 14
What does eliminating the flare on an MS fitting do?
Correct Answer
makes it simpler and easier to work with
provides safe and strong connection
can withstand more vibration before leaking
Page 3 of 21
