TSUM - 3-021 A-Frame Fold (Park) (122) Part 1

TM 5-5420-279-23

TSUM - 3-021 A-Frame Fold (Park) (122) Part 1

A-Fram e Fold

will not park

For the A-Fram e to fold closed (park) the following

conditions m ust be satisfied:-

Neutral gear selected

Parking brake applied

Tail Lift Pendant connected & powered

Chest Pack not connected

4 Position Switch at position 2

Ensure E-STOP RESET satisfactory

Transport Pins rem oved

A-Fram e fold open (Deploy) lim it switch activated

Launcher solenoid supply enabled (KA1 energised)

A-Fram e Fold Park button depressed

Power down & replace

launcher

defective Interface

Perform

deploym ent lam p and

lam p test on

Enclosure. To replace

solenoid SV20b caption lit

Interface Enclosure

Operator Panel. Are all

on Operator

lam ps lit?

see m aintenance

Panel?

procedure 5-099

Yes

Disconnect connector

solenoid SV20b

Insert probes of DMM

from solenoid SV20b.

connector LED lit on the

into sockets 1 & 2 of

See m aint procedure

Stabilizer

connector

5-141

Manifold?

Yes

Disconnect connector from

solenoid SV20b.

See m aint procedure 5-141

Replace solenoid

harness if

Connect DMM across solenoid

Is 24V

Yes

coil pins.

connector LED

solenoid supply

not lit. See

See resistance check in m aint

present?

procedure 5-124

m aintenance

procedure 5-139

Replace faulty harness,

Power down & check

Interface Enclosure or junction

harness continuity from

box as appropriate using the

solenoid SV20b to

following m aintenance procedures:-

Go to

Interface Enclosure

Harness 5-139

Part 2

using the cable routing

Interface Enclosure 5-098

tables in section 3.6 of

A-Fram e Junction Box 6-008

Chapter 3

Slide Fram e Junct. Box 5-089

3-48