(a)
Open left side cowl panel.
(b)
Connect electrical power to airplane.
(c)
Close applicable oil quantity circuit breaker on panel P6.
(3)
Adjust Oil Quantity Indicating System
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79-31-0 Page 508 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 15/69
NOTE: Do not adjust the oil quantity indicating system during keying of an HF system transmitter. Keying of an HF system transmitter when the airplane is on the ground with entry doors open, and with service interphone cords and grounding straps connected may cause a shifting or fluctuation of the oil quantity indicator readings.
(a)
Disconnect tank unit and connect variable capacitance tester and harness into oil quantity indicator circuit per Fig. 501.
(b)
Adjust tank unit section of tester to 22.30 MMF. Adjust compensator section to
108.80 MMF.
(c)
Adjust potentiometer screw marked E at back of oil quantity indicator, until indicator pointer reads exactly zero.
NOTE: Push test switch after each small increment of adjustment is made. Check that indicator pointer moves in a downward direction and returns to the adjusted reading when switch is released.
(d)
Adjust tank unit section of tester to 87.70 MMF. Compensator section shall be left on
108.80 MMF.
(e)
Adjust potentiometer screw marked F on back of oil quantity indicator, until indicator pointer reads 4.75 U.S. gallons.
(f)
Readjust tank unit section of tester to 22.30 MMF. Compensator section shall be left on 108.80 MMF.
(g)
Check that indicator pointer shall read zero. If necessary, readjust E screw on back of indicator.
(h)
If E screw was adjusted in step (g), readjust tank unit section of tester to 87.70 MMF. Compensator section shall be left at 108.80 MMF.
(i)
Check that indicator reads 4.75 U.S. gallons. If necessary, adjust F screw on back of indicator.
NOTE: Since there is interaction between the E and F adjustment screws, it is necessary to repeat the adjustments of each screw until their effect on each other is at a minimum.
(j)
Perform oil quantity indicating system test in 3.A.
D. Oil Quantity Indicating System Adjustment (Alternate Wet Oil Tank Calibration).
(1) 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, Maryland (two required)
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4) Capacitance - Type Liquid Quantity System Test Set, Model TF-20, Consolidated Airborne Systems Inc., Carle Place, Long Island, New York
(b) Adapter Harness Test Set - Boeing F72731
(2)
Prepare Oil Quantity Indicating System for Adjustment
(a)
Open left side cowl panel.
(b)
Connect external electrical power.
(c)
Close applicable oil quantity circuit breaker on panel P6.
(3)
Adjust Oil Quantity Indicating System
(a)
Disconnect tank unit and connect variable capacitance tester and harness into oil quantity indicator circuit per Fig. 501.
(b)
On the tester, adjust tank unit section to 22.3 MMF and compensator section to 108.8 MMF.
NOTE: Compensator section setting must not be altered until test is complete.
(c)
Adjust the potentiometer screw marked "E" located at the back of the oil quantity indicator on the center instrument panel (P2-2), until the indicator pointer shows "zero".
NOTE: Push the "test switch" after each adjustment. The indicator needle shall move downscale and shall return to normal reading when the test switch is released.
(d)
On the tester, adjust tank unit section to 87.70 MMF.
(e)
Adjust the potentiometer screw marked "F" located at the back of the oil quantity indicator until the indicator pointer shows 4.75 U.S. gallons or 3.96 imperial gallons.
(f)
Reset the tester to the settings of par. D.(3)(b) and recheck the reading to be "Zero". If necessary, readjust the "E" screw on the back of the indicator to show "Zero" on the dial.
(g)
If the "F" adjustment was reset under par. D.(3)(f) above, reset the tester to the settings of par. D.(3)(d) and re-check the indicator reading to be 4.75 U.S. gallons or
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