AFGS�87219B APPENDIX A
c. As a result of its location in the cockpit, one aircraft battery not only required seat removal for battery maintenance, but also subjected the crew to smoke and fumes in the event of a major battery failure. The cockpit is a poor location for the aircraft main battery.
d. Silver-zinc secondary batteries were used in one aircraft because of their very high energy density. However, these batteries have a very limited cycle life and are extremely susceptible to internal shorting. Because of the numerous catastrophic
failures which were experienced, this type of secondary battery is not recommended for aircraft.
e. Because of the weight and space penalties involved, inadequate batteries are often selected for the required performance. Insufficient de-rating for temperature, aging, on-board charge efficiency, and high discharge rates are common pitfalls.
f. One aircraft's batteries are installed in fiberglass boxes with attached circuit breakers.
The entire assembly (box, battery, circuit breaker, wiring, and connector) must be removed each time the battery is removed for maintenance. Due to the close proximity of components, electrical shorting is reported to be a frequent problem during such maintenance.
g. Sealed lead-acid batteries are now gaining support due to their reduced maintenance factors and cost. Adequate charging systems are required and heaters may be needed for cold-temperature use.
A.4.2.9.2 Batteries.
Compliance with the battery requirements of 3.2.9.2 shall be verified by analyses, tests, and inspection as follows: ------------.
VERIFICATION RATIONALE (A.4.2.9.2)
Analyses, tests, and inspection are the appropriate means of verifying conformance with the battery requirements.
VERIFICATION GUIDANCE (A.4.2.9.2)
a. The battery, battery charger, and any other functional components of the battery
system require qualifications to their own procurement specifications. Furthermore, if a previously qualified standard battery is selected, additional battery testing may be needed if requirements of the application exceed those of the previous qualification testing.
b. If a battery charger or a battery monitor is part of the system, extensive laboratory testing of the integrated battery system is needed to ensure compatibility.
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