4.5 M-31Arresting Gear

Question 0

What does the M-31 consist of?

Answer 0

2 trailer assemblies on each side of the intended aircraft recovery area , anchored to the deck, connected by a runway cross deck pendant (CDP)

Question 1

What is the purpose of the M-31 MCEAGS

Answer 1

To safely stop tail hook equipped aircraft in a short distance, bi-directionally at an expeditionary airfield

Question 2

What is he hydraulic installation composed of?

Answer 2

Reservoir assembly, Thermo switch, Oil cooler, hydraulic filter, filter gauge, 2 accumulators, pressure roller , & brake clutch, cooling system motor, main control manifold assembly, associated hoses & fittings

Question 3

What is the electric system composed of

Answer 3

Operator control panel, hydraulic control panel, vehicle receptacle assembly, 24v battery, starter motor, starter solenoid, alternator/voltage regulator

Question 4

What is included in the transit lighting

Answer 4

Lights
Electrical cables
Junction boxes

Question 5

What is included in the cooling installation

Answer 5

Radiator
Water pump
Expansion tank
Radiator pressure cap
Check valve
Automatic 3-way valve
Drain valve
Temperature sensor & thermometer
Piping & hoses
Coolant
Y-strainer & screen

Question 6

What is included in the basic trailer assembly

Answer 6

Pressure roller assembly, pendant reel assembly, worm gear assembly, multi-banded belt, roller chain, quadrant control assembly, engine feed & return Jose assemblies, brake manifold assembly, stabilizer ring assembly, basic trailer sub-assembly

Question 7

What is the name for the throttle on the M-31 gear

Answer 7

Quadrant control assembly

Question 8

What is in the basic trailer sub-assembly

Answer 8

Running gear assembly, hydraulic & parking brake installation, mobility cylinders, sheave assemblies (6), trailer platform, primal assembly, front storage box

Question 9

What is in the arrester gear assembly

Answer 9

Energy absorber

Energy absorber roller assembly

Question 10

What is included in the miscellaneous system components

Answer 10

Purchase tape
Tape connector
Cross deck pendant
Tools & storage
Guards & covers

Question 11

What is the function of the hydraulic installation

Answer 11

• Designed to raise and lower the trailer assembly
• controls operation of the friction brake/clutch assembly, pressure roller circuit, cooler installation pump and radiation fan
• provides high pressure (2,200 psi) hydraulic fluid for operation of special tools
• major hydraulic installation components functions

Question 12

Thomas switch

Answer 12

Functions to operate the cooling fans located on the oil cooler

Question 13

Oil cooler

Answer 13

Functions to cool the hydraulic fluid returning to the reservoir

Question 14

Hydraulic filter

Answer 14

Functions to remove any contaminants from fluid returning to the reservoir

Question 15

Hydraulic accumulators

Answer 15

2
Inboard- provides a source of hydraulic pressure to the pressure roller
Outboard-provides a source of hydraulic pressure to the friction brake/clutch circuits

Question 16

Filter gauge

Answer 16

Functions to indicate pressure drop across hydraulic filter

Question 17

Main control manifold assembly

Answer 17

Consists of a metal block with internal hydraulic passages for the various control valves

Question 18

What are the various components for the main control manifold assembly

Answer 18

4-way directional control valve, pretension control valve, relief valve, accumulator check valve, high pressure reducing valve, low pressure reducing valve, motor control valve, bypass valve, motor check valve, flow control needle valve, system pressure gauge, pressure roller manifold, various hose assemblies to carry pressurized hydraulic fluid to the hydraulic system

Question 19

What is the purpose of the electrical installation

Answer 19

Provides electrical power for charging the battery, monitoring engine functions, powering the engine starter, lighting system, hydraulic components

Question 20

Operator control enclosure assembly

Answer 20

Mounted on support brackets attached to the top of the diesel engine that contains 4 terminal boards, 5 relays, & a 10 Amp fuse

Question 21

Operator control panel

Answer 21

Mounts tot eh top of the enclosure & is divided into 5 functional sections with each section containing controls/indicators for operating & monitoring the M-31 system

Question 22

What does MCEAGS stand for

Answer 22

Marine Corps Expiditionary Arresting Gear System

Question 23

Hydraulic control panel enclosure

Answer 23

Mounted on the runway side, rear face of the hydraulic reservoir mounting bracket

Inside is the hydraulic heat exchanger fan relay and terminal boards

Question 24

Hydraulic control panel

Answer 24

Contains:

• The mobility system hydraulic pressure switch which must be in the ON position for operation of the mobility system
• the FWD & Rear mobility system
• RAISE & LOWER switches
• the 24v outlet for the portable spotlight only switch

Question 25

Vehicle receptacle

Answer 25

Provided to receive an external power source in case of loss of battery charge

Question 26

Battery (24v)

Answer 26

Aircraft battery with sealed cells & is the electrical power source for trailer electrical components except for the transit lighting

Question 27

What are the different types of installations of the M-31

Answer 27

• Routine/hard soil and asphalt under 8 inches
• rock
• asphalt thicker than 8 inches/coral
• sand/weak soil
• concrete

Question 28

Starter motor

Answer 28

When current is supplied to the starter motor, by the starter solenoid, teeth on the engine flywheel, rotating the flywheel and starting the engine

Question 29

Starter solenoid

Answer 29

When energized, the solenoid closes a contact, which transfers high electrical current flow from the battery to the starter motor