f he had simply stated that the bulb drew thus and such a current and was
used
in a swing-down application, I would have simply stated that he was using the
wrong bulb number

Ok here are the facts.
The plane is a 1973 Cessna 172 M.
The landing light is a 4522. 250 watt at 14 volts. By ohms law is draws 17.86
amps.
The Circuit Breaker Part number is S-1360-20---20 amp
This is from the equipment table on page 20-35
Either the Cessna book is wrong or the light should be of lower wattage or the
circuit breaker should be of a higher amperage.
Hank