The publication, Service Letter 385, details an approved modification to the Beta Pressure System. The addition of a restrictor fitting before the Beta Pressure Switch will dampen pressure fluctuations in the system, which can cause the Beta Pressure Indicator Light to flicker in flight.
The modification is not mandatory, and can done at the owner’s discretion. It is possible that the modification had been done previously per 610494 Rwk. #6B. A check of the aircraft’s maintenance records will verify whether the rework was accomplished.
The Beta light is controlled by oil pressure, and illuminates when it is safe to put the propeller into reverse for braking on landing rollout. Fluctuations in oil pressure in the Beta Tube System can cause the Beta light to flicker. The modification basically involves the installation of a restrictor fitting in the tube leading to the Beta Pressure Switch. light bulb ban
The modification is based on a redesign of the Beta Pressure System that was implemented light bulb ban for JetProp Commander models (the 840, 980, 900, and 1000); thus, those models are not affected by the Service Letter. light bulb ban
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