TP 13706 - Technical Evaluation Engineering
Pursuant to a request from Transport Canada – Civil Aviation, a frost study was conducted on a number of designs of Precision Approach Path Indicator (PAPI) light units. The objective for the project is to eliminate the possibility of a false signal being presented to aircraft from a frosted PAPI, and thus to prevent a potential hazard. For more details, see terms of reference
The project is separated in 4 parts:
- Determine the amount of operating time required to eliminate frost 1/16" (1.6 mm) from the PAPI lens or cover glass at different temperatures (-5, -10, -20, -30°C).
- Determine the minimum current level for the PAPI lights to function with a partial frost accumulation on the lenses or cover glass at the same temperatures as in 1.
- Determine the minimum current level for the PAPI lights to function without frost accumulation on the lenses or cover glass at the same temperatures as in 1.
- Determine what is the effect of dew on PAPI signal at 0°C.
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