CALENDAR INSPECTION

All liquid oxygen converters are given the calendar inspection before they are placed in

Table 12-18.-Visual Inspection of Type GCU-24/A Liquid Oxygen Converter (P/N 10C-0016-10)

service, and at intervals not exceeding 231 days thereafter. This interval applies to all converters; aircraft-installed, shop spares, and those maintained in a servicing pool.

The calendar inspection consists of a visual inspection followed by a bench test. All work is performed in a clean, dust-free and oil-free area. Converter assemblies found to be damaged or out of adjustment are repaired by replacing or adjusting the discrepant part or parts. After repair, repeat the bench test.

VISUAL INSPECTION

Visually inspect the converter assembly in accordance with table 12-18.

Liquid oxygen converters failing the visual inspection or bench test are repaired, if the specific repair is authorized. SM&R maintenance is authorized to perform repairs. Further explanation is found in Naval Aviation Maintenance Program (NAMP), OPNAV 4790.2 (series).

SERVICE LIFE

Liquid oxygen converters can remain in service as long as they continue to function properly.

BENCH TEST

The bench test is performed using the Liquid Oxygen Converter Test Stand P/N 59A120, 31TB1995-1 or 31TB1995-4. Refer to chapter 11 for identification of test stand controls and indicators referenced in bench test procedures. Do not attempt to perform any bench test without first becoming thoroughly familiar with the test stand. Use Performance Test Sheet (fig. 12-8) when performing the bench test.

The following tools and materials are required for this test:

In the following descriptions, the tests are arranged so they proceed from one test to the next with a minimum of flo w changes. Troubleshooting tables accompany many of the tests.

The first step in the bench test is to find the tare weight of the converter. Tare weight is the weight of the complete converter assembly less the weight of the LOX. Proceed as follows:

1. Ensure all LOX has been removed from the converter.

2. Place the converter assembly on scales having at least a 50-pound capacity. Record weight in space provided on performance test sheet.