0770741-2 – Textron Aviation OEM Positive Battery Terminal Cover
Available now on the Airparts.aero Marketplace.
Overview
The 0770741-2 is a critical safety device, specifically the genuine Textron Aviation (Cessna) Original Equipment Manufacturer (OEM) insulating cover for the positive (+) terminal of the main aircraft battery. This is not an optional or cosmetic part; it is an essential component designed to prevent catastrophic electrical short circuits. Its sole function is to provide a robust, high-dielectric barrier over the energized positive battery post and its connected cable lug, eliminating the risk of accidental contact with the surrounding airframe or other metallic components.
Manufactured from a durable, flexible, and acid-resistant polymer, this cover is molded for a precise, snug fit to ensure it remains securely in place. A missing, cracked, or improperly fitted battery terminal cover is a significant safety hazard and an unairworthy condition that can lead to arcing, fire, or battery explosion.
Key Features
Genuine Textron Aviation (Cessna) OEM Part: Guarantees the part is manufactured from the correct material with the proper fire-retardant and dielectric properties, ensuring a perfect fit and certified safety.
Critical Electrical Safety Device: Provides essential protection against accidental short-circuiting of the main battery, a high-amperage electrical source.
Insulates Positive (+) Battery Terminal: Specifically designed to fully encapsulate the positive battery post and the attached high-current cable terminal.
Durable, Acid-Resistant Material: Molded from a high-quality, flexible polymer (such as PVC) that resists degradation from exposure to sulfuric acid fumes and the engine compartment environment.
Red Color for Positive Identification: Universally colored red for immediate and unambiguous identification of the positive terminal, conforming to standard aviation and electrical practices.
Prevents Arc Flash and Fire: A simple but vital component that mitigates the risk of a high-current arc flash, a primary cause of electrical fires and severe personal injury.
Technical Specifications
Part Number: 0770741-2
Component Type: Battery Terminal Cover / Insulator Boot
OEM Authority: Textron Aviation (Cessna)
Application: Positive (+) Main Aircraft Battery Terminal
Material: Flexible, high-dielectric strength polymer (e.g., PVC or synthetic rubber).
Color: Red
Governing Specification: Textron Aviation Engineering Drawing 0770741.
Aircraft Compatibility
This OEM battery terminal cover is the standard fitment on a vast range of Textron Aviation (Cessna) piston aircraft.
Primary Cessna Platforms:
Cessna 172
Cessna 182
Cessna 206
Cessna 210
Cessna 310, 337, 340, 400-series twins
And many other models.
Note: Verification of applicability is the absolute responsibility of the installer. The aircraft's current Illustrated Parts Catalog (IPC) for its specific serial number is the final authority for confirming part number eligibility.
Applications
Sole Application: To provide electrical insulation and physical protection for the positive terminal of the main aircraft battery (e.g., Gill G-25/G-35, Concorde RG series) and its associated cable lug.
Why Choose 0770741-2?
The potential energy stored in an aircraft battery is immense. A missing or deteriorated terminal cover is a direct violation of airworthiness standards. The genuine Textron OEM 0770741-2 is the only part guaranteed to be molded for a precise, secure fit and manufactured from the correct, certified materials that will not degrade from acid exposure or support combustion. A generic automotive cover may not fit securely, may lack the required dielectric strength, and is not certified for aviation use, creating a false sense of security for a life-threatening hazard.
The necessity of the 0770741-2 cover is dictated by the physics of a direct short circuit and the potential for a catastrophic arc flash. An aircraft lead-acid battery has an extremely low internal resistance, allowing it to deliver a prospective short-circuit current that can exceed 2,000 amperes. If a conductive object creates a path from the positive terminal to ground, this immense current instantly vaporizes the metal at the points of contact, creating an explosive plasma arc. The temperature within this arc can exceed 35,000°F (19,400°C), hotter than the surface of the sun. This event violently expels molten metal and creates a pressure wave. Simultaneously, the massive current draw causes the battery to rapidly outgas large volumes of explosive hydrogen gas. The 0770741-2, a simple insulating polymer cover, provides the critical dielectric separation (clearance and creepage distance) necessary to prevent the initiation of this catastrophic chain of events.
Note: This is a flight-critical safety component. It must be installed and in good condition at all times for the aircraft to be considered airworthy. It should be inspected regularly for cracks, hardening, or any signs of physical degradation or acid damage. During battery maintenance, the ground (negative) cable should always be disconnected first and reconnected last to minimize the risk of an accidental short circuit should a tool slip and contact the positive terminal.
Documentation
All technical data for the 0770741-2 cover is proprietary to Textron Aviation. This information is contained within the official Maintenance Manual and Illustrated Parts Catalog for the applicable aircraft model. No public-facing documentation is available.