ASPSU - Test

TM 10-1670-265-12&P

T.O. 13C7-1-21

4-17. ASPSU - Test

4-17

This task covers: Testing

INITIAL SETUP

General Safety Instructions:

Test Equipment:

WARNING

ASPSU test set FLT4240

Always insure that the ASPSU test set is

depressurized before attempting to open chamber

Tools:

door as personnel injury may result.

Rigger's knife NSN 5110-00-162-2205

Screwdriver, cross tip NSN 5120-00-234-8912

WARNING

Screwdriver, plane tip NSN 5120-00-979-4557

The altitude sensor parachute staging unit (ASPSU)

contains a class C explosive in the cutter

Materials:

mechanism of the cutter module. Procedure steps

Webbing - Item 5, Appendix D.

(Required for

shall be followed to prevent early activation and

destructive test only.)

possible personnel injury.

WARNING

Personnel Required:

When connecting the ASPSU arming cable, do not

43E (10) parachute rigger

pull on cable as force in excess of 18 lbs. may

cause the ASPSU to activate resulting in personnel

Reference Information:

injury.

TM 10-1670-266-13&P

TB 750-126

NOTE:

The instructions pertain to the functional group

Equipment Conditions:

number sequence 02 in the MAC and RPSTL.

External power of ASPSU test set must be connected to

115 VAC @ 60 5 Hz

Special Environmental Conditions:

Temperature: Room Ambient, 70° ± 10°

(22° ± 4° )

Humidity: Room Ambient, 55% normal

TESTING

1. General information.

a. Functional description of ASPSU

(1) ASPSU Overall Function Description. The mechanically joined modules constitute the ASPSU. Electrical

interface between the modules is effected by a mated connector pair when the two modules are joined. The interface

supplies d.c. voltage from the thermal battery to operate the sensor electronics which in turn furnishes the command

signal to activate (fire) the webbing cutter.

(2) Electronic Circuit Function. The altitude sensor electronics is a single printed circuit card assembly mounted

in the altitude sensor module. The electronics perform the primary function of sensing altitude, or atmospheric pressure,

and converts this pressure to a calibrated d.c. voltage which is further conditioned to provide a signal to activate the

webbing cutter.

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