I.F.F/S.S.R. TRANSPONDER CONTROL UNIT TYPE 16929
LEADING PARTICULARS
| Stores Ref. No.: | 10L/9563379 |
| Nato Stock No.: | 5895-99-956-3379 |
| Attachment: | Dzus D5 Panel Line quarter turn fasteners |
| Connection: | 602 pattern, 55 way |
| Installation: | A.R.I. 23134/3 |
DESCRIPTION
The control unit interfaces directly to the transponder unit of the Mk10 IFF (Indication Friend or Foe) / SSR (Secondary Surveillance Radar) system, otherwise known as IFF/SSR 1520.
The purpose of this system is to reply to radar interrogation with a coded number, which identifies the aircraft to the radar operator.
Inside unit: switches and lashed wiring harness.
SIMULATION
Simulation is anticipated to be straightforward as the control units switches all control individual ways of the connector. IFF is modelled within flightgear, aiding multi-player scenarios and air traffic control.
MIL-C-26482 22-55P connector for interfacing.
The MIL-C-26482 connector is marked 22-55P; the 22 being 22 16ths of an inch in diameter, and the 55 is the contact count, the P means Pins (instead of S for Socket), no further identification letters indicates a 'normal' orientation.
A free socket of the right orientation, contact count and size was acquired, however the additional keyways were offset in different locations, so they were removed (filed off) in order to allow this free socket to be used with this control unit.
REFERENCES
T Mk.5 electrical "Vol. 1":
A.P.101B-1005-1B, Sect. 9, Chap. 2, A.L.59 Sept. 1973, I.F.F/S.S.R. 1520 - Paragraph 4
T Mk. 5 wiring diagrams:
AP101B-1005-10, Sheet 36, A.L.3, Nov 1981, Cabin Lighting, Port
AP101B-1005-10, Sheet 57, A.L.6, Jan 1985, Radio and Radar Installations - Fig 3, I.F.F./S.S.R. 1520