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For the additional values referred to in NOTE 1 above see
R  (Ref. Fig. 309) The value on the vertical scale is the additional value of capacitance in pF to be added to the MEAN THEORETICAL (MTV) when the fuel tanks are wet.
 EXAMPLE (Simmonds FQIS)
 The MTV for Probe 21QT1 is 64.516pF.
 Immediately after draining an additional 0.25pF is to be added to this
 value, (from slope 1).
 64.516 + 0.2 = 64.716pF
 After one hour this additional value will have reduced to 0.105pF, (from slope 2).
 64.516 + 0.105 = 64.616pF
 This later value will remain constant for sixty hours in a sealed tank.
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 4. Optional Ground Support Equipment for the Fuel Quantity Indicating System
_________________________________________________________________________
 and Fuel Level Sensing System.

 GENERAL
 The PSDA321-1 Test Set, PSDA321-2 and PSDA321-3 Interface Units, and
 associated cables are used to support the Simmonds Fuel Quantity Indicating
 System (FQIS) and the Fuel Level Sensing System (FLSS) installed on the
 aircraft. When used together with the PSD30-2 Universal DC Fuel Quantity
 Test Set, these units allow complete testing of all tank mounted components
 and aircraft wiring associated with the FQIS and FLSS.

 PSDA321-1 TEST SET
 The PSDA321-1 Test Set allows access to and provides test capability of all
 tank mounted Temperature sensors, Level sensors, and Ultracomps, and also
 will allow access to the fuel quantity probes for measurement using the
 PSD30-2 Universal DC Capacitance Test Set. The Ultracomp operation is
 checked for functionality and valid resistor values. The Temperature sensors
 and Level sensors are checked for valid resistance values. The condition of
 these parameters are annunciated using LEDs to indicate a PASS/FAIL
 condition.
 Includes PSDA321-107 Interconnect Cable to connect to PSDA321-2 or
 PSDA321-3.

 PSDA321-100 CABLE SET
 Allows PSDA321-1 to be connected at the tank wall connectors to provide
 direct access to the tank mounted components and tank wiring.
 Consists of the following cables:

 - PSDA321-101, Wing Tank Group A

 - PSDA321-102, Wing Tank Group B

 - PSDA321-103, Surge Tank

 - PSDA321-104, Center Tank Group A

 - PSDA321-105, Center Tank Group B.

 PSDA321-2 FLSCU BREAKOUT UNIT
 Used with the PSDA321-1 Test Set to allow all testing to be preformed at the
 FLSCU rack connector.

 PSDA321-3 FQIC BREAKOUT UNIT
 Used with the PSDA321-1 Test Set to allow all testing to be preformed at the
 FQIC rack connector.

 PSDA321-4 DISCRETE INDICATION SWITCH UNIT (DISU)
 Used with the PSDA321-2 to simulate relay closures which are normally output
 from the FLSCU. It can also be used with the PSDA321-3 to display the status
 of the discrete outputs which come from the FLSCU.

 PSD30-2 UNIVERSAL DC CAPACITANCE TEST SET - For aircraft equipped with
 Simmonds Precision DC fuel systems.
 The PSD30-2 Universal DC Capacitance Test Set is a highly accurate test set
 with the capability to calibrate and test a DC capacitance type fuel
 quantity measuring system (wet or dry).
 The Test Set performs three basic functions:

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 - measurement of DC capacitance values of the DC type tank units

 - simulation of DC capacitance

 - DC voltage measurement.

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 CES

 **ON A/C ALL

 5. Maintenance Notices
___________________ The maintence notices that follow are to give you an introduction or understanding of possible reported problems associated with the FQIS.
 The maintenance notices provide useful data for the maintenance staff.
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