(c)  
If the pointer does not move in a downscale direction when the TEST SWITCH is pressed, troubleshoot the system (Ref 79-31-0, page 101).

(d)  
Switch the tester FUNCT switch to the AIRCRAFT ONLY Position. Reconnect the two banana plugs and the BNC coaxial lead to the box in the center of the "T" cable. This reconnects the tank unit to the indicator.

CAUTION:  DO NOT ADJUST THE COMP SIMULATOR. ADJUSTING THE COMP SIMULATOR CAN CAUSE THE INDICATOR TO SHOW THE WRONG OIL QUANTITY.

(e)  
Add 4.8 U.S. gallons of oil to the tank.

CAUTION:  EITHER HYDROCARBON OR SYNTHETIC ENGINE OILS MAY BE USED IN THE JT8D ENGINE, BUT THE OILS MAY NOT BE MIXED PER PRATT & WHITNEY STANDARDS. IF OILS WHICH ARE NOT COMPATIBLE ARE MIXED, THEY CAN REACT AND CAUSE DAMAGED TO THE ENGINE.

(f)  
Adjust the screw marked "F" on the back of the indicator until the pointer reads 3.5 gallons. Press the OIL QTY TEST switch momentarily and release. Readjust the "F" screw if it is necessary to return the pointer to 3.5 gallons.

NOTE:  When adjusted in this manner, the oil quantity indicator displays the useable quantity of oil in the tank. The remaining 1.3 gallons is not available to the engine and is not measured by the indicator.

(g)  
Disconnect the two banana plugs and the coaxial BNC from the right side of the box in the center of the "T" cable.

(h)  
Switch the FUNCT switch on the tester to SIM TU & COMP position. Press the OIL QTY TEST switch momentarily and release. Readjust the "E" screw if it is necessary to cause the pointer to read 0 gallons.

(i)  
Finish the servicing procedure for the engine oil tank (Ref 12-13-1/201).

(j)  
Pull the circuit breaker C280 or C281 on the P6 Load Control Panel for the oil quantity indicating system being adjusted. Turn the tester to OFF and disconnect the tester from the "T" cable and the airframe ground.

(k)  
Disconnect the "T" cable from the indicator and the aircraft wiring. Reconnect the two banana plugs and the coaxial BNC connector at the center of the "T" cable.

(l)  
Reconnect the indicator to the airplane wiring. Close the circuit breaker on the P6 panel and verify that the oil quantity indicator reads 3.5 gallons. Return the panel lighting to the normal level.

(m)  
Close the left cowl panel (Ref 71-11-11 R/I) and remove the power from the airplane if it is no longer needed.

500 
79-31-02 Page 506  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/92 

C.  Calibrate the indicator with the oil remaining in the tank.
(1) 
 General

(a)  This procedure is intended for calibrating the indicator after a faulty indicator has been replaced and operational considerations do not permit completion of the preferred Methods 1 or 2.

(2)  
Equipment and Materials

(a)  
PSD60-1, Simmonds Precision Capacitance Tester, Simmonds Precision Product, Support Division, 5250 N.W. 23rd Ave., Ft. Lauderdale, Florida 33309

(b)  
PSD40-503 "T" cable, Simmonds Precision Product, Support Division, 5250 N.W. 23rd Ave., Ft. Lauderdale, Florida 33309

(c)  
Tester grounding cable, banana plug to alligator clip

(3)  
Prepare Oil Quantity Indicating System for Adjustment

(a)  
Pull circuit breaker C280 or C281 on the P6 Load Control Panel to remove power from the oil quantity system to be adjusted. Turn panel lighting OFF.

(b)  
Turn the PSD60-1 tester on and allow it to warm up for 3 minutes.

(c)  
Connect the tester CHASSIS jack to a good airframe ground (seat rail) using the grounding cable provided with the tester.

(d)  
Remove the indicator for the tank to be calibrated from the panel. Disconnect the electrical connector from the indicator jack.

(e)  
Connect the PSD40-503 "T" cable to the wiring plug and the indicator.

(f)  
Make sure that the banana plugs and the coaxial BNC connector on the box at the center of the "T" cable are disconnected. This disconnects the tank unit from the oil quantity indicator.

(g)  
Connect the "T" cable coaxial lead marked "H" to the tester terminal marked INDICATOR-HIZ. Connect the "T" cable lead marked "T" to INDICATOR-LOZ, and the lead marked "C" to INDICATOR-COMP.

(h)  
Select MEASURE INT with the FUNCT switch of the tester.

(i)  
Change the SELECT switch to the TU position. Adjust the TU SIMULATOR knob to read 22.3 pf on the LCD display. This is the nominal capacitance for an empty tank.
　
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