OIL QUANTITY INDICATING SYSTEM - TROUBLE SHOOTING
1. General
A. To determine and correct the cause of oil quantity indicating system malfunctions, the symptoms should be studied carefully. Each possible cause should be checked, beginning with the most probable, until the exact cause of the malfunction is determined. The following chart lists troubles likely to occur in operation of the system.
2. Equipment and Materials
A. Any of the following capacitance testers may be used:
(1)
Field Calibration Unit, Part No. 387016-1 or 387991-003, Simmonds Precision Products, Inc., Tarrytown, New York
(2)
Variable Capacitance Tester, Type 1429-A or MD-1, with current calibration chart, General Radio Co., West Concord, Massachusetts
(3)
Variable Capacitance Tester, Type HT-109, Honeywell Inc., Annapolis Operation, Annapolis, Maryland (two required)
(4)
Capacitance - Type Liquid Quantity System Test Set, Model TF-20, Consolidated Airborne Systems Inc., Carle Place, Long Island, New York
B. Ohmmeter - for continuity checking
C. Cleaning solvent - Acetone
D. Stoddard solvent or equivalent
500
May 01/98 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 79-31-0 Page 101
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Indicator reads low Indicator reads high Indicator out of adjustment Compensator capacitance high Defective indicator Indicator out of adjustment Compensator capacitance low Perform adjustment procedure Remove tank unit and immerse portion of tank unit below flange assembly in acetone for a maximum of twenty minutes. Agitate unit in the solvent to remove foreign material. Rinse in clean Stoddard solvent and allow to air dry. Measure compensator Capacitance between center of pin 1 and pin 3 while grounding pin 2 to flange. Capacitance should be 27.50 MMF. If not, adjust outer compensator tube assembly by loosening cap screw and adjusting assembly until capacitance is exactly 27.50 MMF. If desired capacitance can not be obtained, compensator tubes are defective Perform adjustment procedure Remove tank unit and adjust compensator capacitance to 27.50 MMF. (Tank unit must be dry.) If desired capacitance cannot be obtained, compensator tubes are defective Replace tank unit Replace indicator (Ref. 31-00-11 R/I) Replace tank unit
Open compensator circuit Defective indicator Continuity check system wiring and check tank unit capacitance Repair defective wiring or replace tank unit Replace indicator (Ref. 31-00-11 R/I)
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