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AVIATION

HOBBS Meter Enable Circuit

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UPDATED 2026-09-16
TYPECircuit
USE-CASEHobbs Enable
EXAMPLEHOBBS Meter Enable Circuit
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CASE ANALYSIS

Scenario

A Lycoming O-360 installation needs the HOBBS hour meter to run only when oil pressure is present and after a 5-second start delay to avoid recording engine start cranking.

Key decisions

  • Power feeds through a 1 A breaker to protect the HOBBS meter circuit.
  • An oil pressure switch enables the relay coil, so the meter only runs with engine oil pressure.
  • A 5 s time delay relay prevents the HOBBS meter from logging the start sequence.

When to reuse this

Use when wiring a HOBBS meter in small aircraft with battery, oil pressure switch, breaker, and start delay.

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