Lightning T5 and T55 ⚡ Flight Simulator

(Example image from XS458)

WANTED:
RAM AIR TEMPERATURE INDICATOR TYPE S149-1-552

LEADING PARTICULARS

Stores Ref. No.:	6A/12667
Manufacturer:	Sangamo Weston
Attachment:	Clamp, instrument securing type C.12956

DESCRIPTION

For monitoring external "ram air temperature", or "total air temperature", which can rise under conditions of hot ambient weather, and fast low level flight.

The purpose is to protect the airframe and certain pieces of equipment from overheating. The aircrew manual linked below gives temperature limitations.

This indicator is a ratiometer type of indicator, fed from a total air temperature probe mounted on the spine skin.

It will operate when DC power is online.

Dates

This indicator is included in the T Mk.5 electrical "Vol. 1" 1985 amendment but is not in the 1974 amendment, suggesting it was a modification introduced between the two dates. This window may also be narrowed further as the T Mk.5 wiring diagrams at A.L.3, from November 1981 also include this indicator.

CIRCUIT DIAGRAM

The internals of the sensor and indicator illustrated, and interconnecting wiring taken from AP101B-1005-10 Sheet 28, A.L.3, Nov. 1981.

SIMULATION

I wrote a 'nasal' script for the FGUK Lightning model to calculate the ram air temperature, which takes the ambient temperature and compensates for Mach No., so currently the data is available within the simulator model, I now need to find an indicator to work out how to electrically drive it.