SECTION I. INTRODUCTION - TM-55-4920-378-14-P0008

TM 55-4920-378-14&P

SECTION I

INTRODUCTION

1-1. GENERAL.

This handbook contains operation and maintenance instructions for the Pitot and Static Tester, TPS-2550-1 and TPS-2550-2

(See Figure 1-1) manufactured by the Aerosonic Corporation.

1-2. PURPOSE OF EQUIPMENT.

The tester is a portable, self-contained vacuum and pressure tester whose purpose is the testing of aircraft altimeters, rate of

climb indicators, airspeed indicators, manifold pressure gauges and fuel pressure gauges. The tester accurately effects engine

or atmospheric vacuums and pressures such as are met in the normal operation of an aircraft. The vacuums and pressures are

accomplished by means of a small high speed pump capable of producing a vacuum of 29 inches of mercury and pressures up

to 25 pounds per square inch.

The overall size of the tester is 16 9/ 16 inches wide by 14 9/16 inches deep by 18 inches high. This includes a removable

cover which contains all the accessories and tools necessary for proper operation of the tester. With the cover removed, all

of the major operating components of the tester are visible. These consist of five aircraft instruments representative of the

types to be tested: two multiple function selector valves (Figure 1-1, Ref. 1 and 17), one for vacuum and one for pressure

tests: four micrometer needle valves (2 and 3) used for fine or vernier control of vacuum and pressure; a power switch (4) for

the pump motor, along with an indicator lamp (5) and fuses (6). At the rear of the tester are four self-sealing quick-couplings

(7) for connecting air lines and a multi-terminal AN receptacle (8) for electrical connections. Along the top of the instrument

is a Table (10) which gives the latest calibration corrections for the master instruments on the tester panel. Under this Table,

accessible by lifting the narrow aluminum cover, are five small selector valves (9) used for self-checking of the tester master

instruments during calibration and recalibration of these instruments. For convenient access to components of the tester. the

main panel is hinged at the top and may be opened by turning the five Camloc fasteners ( 11 ) accessible from the front. When

the main panel is opened the motor pump assembly, air-oil reservoir and the electrical power supply components are visible.

In addition, the side doors and the lower front panel are hinged and secured with Camloc fasteners (11). These doors provide

access to the reservoir, with its drain-refill valve and hose, and the filter sumps in the vacuum and pressure systems. The lower

front panel provides access to the two vacuum (12) and three pressure ( 13) safety valves. The tester is designed to operate

from three separate and distinct power sources.

1 . 28 Volts, d.c.

50-500 cycles, single-phase

115 Volts, a.c.

50-500 cycles, three phase

115 Volts, a.c.

1-4 ACCESSORES SUPPLIED WITH TEST SET.

1-1