011-00868-10

GRS 77 attitude and heading reference system unit 011-00868-10

011-00868-10 is the exact Part Number for this Garmin GRS 77 attitude and heading reference system unit. The unit calculates attitude, heading and related motion data for compatible integrated flight-display systems. This card is tied to the photographed configuration and complete suffix, rather than serving as a generic listing for every GRS 77 version or a visually similar member of the same family.

The partner listing identifies this exact unit as a serviceable FAA TSO attitude and heading reference unit. The original factory plate confirms the GRS 77 model, Part Number 011-00868-10, serial number 42035965, 14/28 V DC supply, DO-160D environmental reference and DO-178B Level B marking for the photographed configuration. The identification information is important because voltage, lighting, software, hardware options, certification and connector configuration can differ across related versions. The complete Part Number and the approved technical record must be checked together before purchase or installation.

Operational role and system function

The GRS 77 is a remote sensor-processing unit rather than a cockpit display. In an approved installation it combines internal inertial measurements with heading information from the GMU 44 magnetometer and air-data information from the GDC 74 or GDC 74A to supply stable aircraft attitude and heading data to compatible Garmin displays. In service, the unit depends on the integrity of its associated sensors, antennas, transceivers, control panels, displays, data buses, wiring, power and grounding. A reported fault at the unit can therefore originate elsewhere in the connected chain, and troubleshooting should follow the approved aircraft and equipment procedures.

The practical role of GRS 77 is to perform its defined function while exchanging required signals with compatible equipment. It cannot replace missing system components and should not be evaluated as an isolated consumer device. Controls or connectors visible in photographs do not prove that every possible function is enabled in a particular aircraft installation.

Installation and connected equipment

Garmin installation data associates the GRS 77 with the GMU 44 magnetometer and compatible GDC air-data computer. Installation requires a rigid approved mounting structure, correct aircraft alignment, two specified power inputs where required, connector backshells, data-bus wiring and post-installation calibration. Location and structural stiffness are critical to AHRS performance. A rack, backplate, connector kit, antenna, wiring, cooling hardware or other accessories are not assumed to be included unless they are expressly listed in the quotation. Similar panel dimensions or family names do not prove electrical or approval compatibility.

Before installation, technicians should compare 011-00868-10 with the removed unit, aircraft equipment list, wiring diagrams, installation manual and modification records. Panel space, mounting depth, connector keying, pin allocation, circuit protection, lighting, ventilation, data format and configuration settings all require confirmation. Any substitution must be supported by approved data.

Configuration checks for 011-00868-10

The suffix in 011-00868-10 is part of the product identity. Software level, modification status, database requirements, embedded options, voltage and certification can affect compatibility even when two units look alike. These checks are especially important in aircraft that have accumulated supplemental approvals, avionics upgrades or wiring changes over time.

Incoming inspection should verify the manufacturer plate, housing, connectors, locking features, controls, display or indicator face, fasteners and evidence of unauthorized modification. Functional testing should use the approved bench procedure for the exact model and suffix. Installation and return to service remain the responsibility of appropriately authorized personnel.

Serviceable condition, ordering and support

This 011-00868-10 GRS 77 is offered in Serviceable condition from partner stock with a six-month warranty. Partner stock should be reconfirmed at quotation because allocation can change. The available serial number, current test status and release documentation for the specific unit are confirmed before order acceptance.

For an inquiry, specify Part Number 011-00868-10, model GRS 77, required quantity, destination and documentation requirements. Including the aircraft type and removed-unit Part Number helps prevent configuration errors. Related avionics can be reviewed in the Garmin / BendixKing / Honeywell / Collins category. Products shown there are related catalog positions, not interchangeable replacements unless approved technical data explicitly says so.

Product Type: Attitude and heading reference system unit

Designation: 011-00868-10

Manufacturer: Garmin

Model: GRS 77

Function: Attitude and heading reference computation for compatible Garmin integrated displays

Associated Units: GMU 44 magnetometer and compatible GDC 74 / GDC 74A air-data computer

Power Supply: 14/28 V DC

Operating Current: 0.3 A at 27.5 V DC in normal operation, including GMU 44, according to the Garmin installation manual

Power Consumption: Not more than 8 W, including GMU 44, according to the Garmin installation manual

Operating Temperature: −55 °C to +70 °C

Maximum Qualified Altitude: 55,000 ft

Dimensions: 82.6 × 95.3 × 215.9 mm / 3.25 × 3.75 × 8.50 in, unit only

Weight: 1.27 kg / 2.80 lb unit only; 1.59 kg / 3.50 lb installed with rack and connectors

Serial Number: 42035965 on the photographed unit

Condition: Serviceable

Warranty: 6 Months

Installation Note: Confirm the exact Part Number, suffix, software or modification status, rack, connectors, wiring and aircraft approval before installation

Technical Documentation: Applicable manufacturer installation and maintenance data plus aircraft wiring and approval documentation

All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.

In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.

Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.

Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.

Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.