**MANDATORY** SERVICE BULLETIN NO.: 1559 Rev A GTN 650 and GTN 750 Notification of Mod Level 5

[delay  11 November 2015]

PRODUCTS AFFECTED

All GTN 650 and GTN 750 navigator units marked as Mod Level 4 or previous mod level are affected.

PURPOSE

An issue has been identified where the VOR/LOC/GS may stop functioning in the affected units. This will be indicated by a message on the GTN and the Nav frequencies will be replaced by a red X.

DESCRIPTION

This service bulletin provides instructions to inspect and return affected GTN 650/750 units to Garmin for a Mod Level change. This service bulletin also provides optional instructions for marking Mod Level 5 on the nameplate (serial tag) of unaffected GTN 650/750 units.

COMPLIANCE

Mandatory for units listed in Table 2. This Service Bulletin must be accomplished by October 31st, 2016. Optional for units not listed in Table 2.

Papatron

35 years component-level Aviation/Electronics repair/Avionics retrofit experience. FCC General Radiotelephone with Ship Radar. Navcom-Audio, Transponder-Pulse-Radar, Autopilot expertise. IT Administration since 1983. Private Pilot since 1986. CAD designer since 1990. FAA Certified Repair Station Chief Inspector since 1994. Started 3 Avionics Shops. College: Business Administration/Marketing. Motorcycle enthusiast. 6 year USAF Veteran, Ground Radio Equipment Technician (30474, E-5). WordPress novice.

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