- the proportion of the probe in fuel after the refuel valve has closed.
NOTE : The values for an ultracomp and a dualcomp with a full tank are given
____ as an aid only. The values given are nominal and variations can be expected with fuel of different permittivities.
OPTIONAL TESTING
Independent measurements can be made before a decision is made to enter (or close up) a fuel tank if the following Test Equipment is available:
- Simmonds DC Capacitance Tester PSD 30-2 (A test set for measuring DC capacitance. The test set to have been calibrated for the A321 type aircraft)
- Simmonds Test Set PSD A321-1 (An interface in the form of a junction/switch box between the PSD 30/2 and the aircraft connected test cable)
- Simmonds Cable Set PSDA321-100 (A set of test cables for connecting between the PSD A321-1 and the required tank wall connector to enable the tank units only to be checked)
- Simmonds FQS Interface Unit PSDA321-3 (An adaptor and cable that permits the PSDA321-1 to be connected to the FQIC rack connector after the removal of the FQIC. This enables the tank units and the aircraft wiring to be checked).
NOTE : A tolerance of + or - 0.03pF plus the tolerance of the DC Capacitance
____ Tester is recommened. This is over and above the values shown in the table below. This gives an allowance for non-laboratory conditions, different operators, and the accuracy of the Test Set used.
Table 304A - Tank Units DC Capacitance Values
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| | | MEAN | TOLERANCE | FULL TANK |
| FIN | PROBE | THEORETICAL | AT DRY pF | pF |
| | FUNCTIONAL DESIGNATION | pF DRY | + OR -| |
|----------|----------------------------|-------------|-----------|-----------|
| 21QT1(2) | PROBE-FUEL QTY, L/R No. 1 | 64.516 | 0.62 | 135.45 |
| | | | | |
| 54QT1(2) | PROBE-FUEL QTY, L/R No. 2 | 63.122 | 0.60 | 132.62 |
| | | | | |
| 23QT1(2) | PROBE-FUEL QTY, L/R No. 3 | 52.723 | 0.55 | 110.59 |
| | | | | |
| 56QT1(2) | PROBE-FUEL QTY, L/R No. 4 | 40.983 | 0.49 | 86.16 |
| | | | | |
| 25QT1(2) | PROBE-FUEL QTY, L/R No. 5 | 56.145 | 0.57 | 117.82 |
| | | | | |
| 26QT1(2) | PROBE-FUEL QTY, L/R No. 6 | 51.012 | 0.54 | 107.08 |
| | | | | |
| 27QT1(2) | PROBE-FUEL QTY, L/R No. 7 | 40.180 | 0.49 | 84.35 |
| | | | | |
| 28QT1(2) | PROBE-FUEL QTY, L/R No. 8 | 36.252 | 0.47 | 76.26 |
| | | | | |
| 29QT1(2) | PROBE-FUEL QTY, L/R No. 9 | 31.149 | 0.44 | 65.38 |
| | | | | |
| 30QT1(2) | PROBE-FUEL QTY, L/R No. 10 | 31.149 | 0.44 | 65.38 |
| | | | | |
| 59QT1(2) | PROBE-FUEL QTY, L/R No. 11 | 29.908 | 0.43 | 62.57 |
| | | | | |
| 60QT1(2) | PROBE-FUEL QTY, L/R No. 12 | 22.700 | 0.40 | 47.72 |
| | | | | |
| 61QT1(2) | PROBE-FUEL QTY, L/R No. 13 | 17.947 | 0.37 | 34.67 |
| | | | | |
| 34QT1(2) | PROBE-FUEL QTY, L/R No. 14 | 17.947 | 0.37 | 34.67 |
| | | | | |
| 35QT | PROBE-FUEL QTY, CTR No. 1 | 75.968 | 0.72 | 158.27 |
| | | | | |
| 36QT | PROBE-FUEL QTY, CTR No. 2 | 75.968 | 0.72 | 158.27 |
| | | | | |
| 37QT | PROBE-FUEL QTY, CTR No. 3 | 75.968 | 0.72 | 158.27 |
| | | | | |
| 38QT | PROBE-FUEL QTY, CTR No. 4 | 75.968 | 0.72 | 158.27 |
| | | | | |
| 39QT | PROBE-FUEL QTY, CTR No. 5 | 67.663 | 0.65 | 141.88 |
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「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : 301-399, ∞∞28-42-00∞∞∞∞∞∞∞∞∞∞Page 359
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----------------------------------------------------------------------------| | | MEAN | TOLERANCE | | | FIN | PROBE | THEORETICAL | AT DRY pF | FULL TANK | | | FUNCTIONAL DESIGNATION | pF DRY | + OR -| pF | |----------|------------------------|--------------|-----------|-------------| | 50QT | ULTRACOMP CTR TANK | 57.000 | 0.83 | 118.43 | | | | | | | | 52QT | ULTRACOMP R WING TK | 57.000 | 0.83 | 118.43 | | | | | | | | 53QT | DUALCOMP L WING TK |(A) 57.000 | 0.83 | 118.43 | | |(Contains 2 compensators|(B) 57.000 | 0.83 | 118.43 | | | A and B) | | | | ----------------------------------------------------------------------------
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