1. Shut down engine that was started first.
a. The red vacuum failure button for that engine in the suction gage should extend.
b. If the failure button for the shutdown engine remains flush with the face of the gage, a vacuum system check valve is defective.
2. With throttle set at 1000 RPM or lower on the running engine, check that the red vacuum failure button in the suction gage for that engine is flush with the gage face.
a. If the red vacuum failure button for the running engine extended when the first engine was shutdown, a vacuum system check valve and/or pump is defective.
Cessna Aircraft Company records indicate that SB MEB99-19 was mailed to the registered owner of N8354N on October 4, 1999. During postaccident interviews, pilots who had flown with the accident pilot reported that he used these procedures routinely. A portion of the procedures outlined in the SB was found in the wreckage.