Ground Power Units : AFSG-1 - MMG-1A


Ground Power Unit AFSG-1

Pierre GILLARD: Ground Power Unit Type AFSG-1 - Aviation royale canadienne-Royal Canadian Air Force &emdash; 2021-430817

The AFSG-1 is a Direct Current (DC) Aircraft Ground Power Unit (GPU). It was designed and built by the Canadian Westinghouse Company Limited of Hamilton, Ontario for the Royal Canadian Air Force (ARC-RCAF). The QAM model was built in 1952. Taking its source from 115/230 VAC 60 Hz, it is able to supply 100 A at 14 VDC or 50 A at 28 VDC. A switch inside the device allows selection of the output voltage. This GPU is intended for use in hangars and workshops. It is equipped with four wheels allowing its movement.

The QAM’s AFSG-1 underwent some minor modifications during its life; it should be restored in the conditions closest to those of the time. It will be able to supply the QAM aircraft requiring an external DC power supply once operational.

The QAM’s AFSG-1 GPU was donated by the École nationale d'aérotechnique in Saint-Hubert, QC. It is currently being restored to working order as part of student activities at the school.

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Mobile Electric Power Plant MMG-1A

Pierre GILLARD: Ground Power Unit MMG-1A - Mobile Electrical Power Plant &emdash; 2022-627782

The MMG-1A is a small, compact, trailer-mounted, electric motor-driven generator set (MEPP-Mobile Electric Power Plant). It provides 60 KVA of power under 115/200-volt, 3-phase, 400-hertz AC, and 500/1,000-ampere 28-volt DC power for aircraft maintenance, calibration, and support. Operation of the unit requires a 3-phase, 60-hertz, 220- or 440-volt external power source. The 30-foot input and output cables are stowed in compartments in the rear and left front side of the unit. It was used by the U.S. Navy both aboard ships (including aircraft carriers) and ashore. The MEPP is not self-propelled and must be towed or manually moved. The 4-wheel trailer is equipped with tie-down rings, pneumatic tires, a mechanical hand brake, and a tow bar for towing and steering.

The QAM’s MMG-1A, bearing serial number PJC084, seems to be in good general condition even if it is no longer able to function normally. It will be able to supply QAM aircraft with both alternating current and direct current once repaired and declared perfectly functional.

The QAM’s MMG-1A MEPP was donated by the École nationale d'aérotechnique in Saint-Hubert, QC. It is currently being restored to working order as part of student activities at the school with the financial support of Bell Textron Canada, Mirabel, QC.

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Dernière mise à jour/Last update : 03-10-2022.

© Pierre GILLARD & Pierre MÉNARD