PDF Publication Title:
Text from PDF Page: 497
9/8/98 AC 43.13-1B e. Battery and Charger Characteristics. The following information is provided to ac- quaint the user with characteristics of the more common aircraft battery and battery charger types. Products may vary from these descrip- tions due to different applications of available technology. Consult the manufacturer for spe- cific performance data. NOTE: Under no circumstances con- nect a lead-acid battery to a charger, unless properly serviced. (1) Lead-acid vented batteries have a two volt nominal cell voltage. Batteries are constructed so that individual cells cannot be removed. Occasional addition of water is re- quired to replace water loss due to overcharg- ing in normal service. Batteries that become fully discharged may not accept recharge. (2) Lead-acid sealed batteries are simi- lar in most respects to lead-acid vented batter- ies, but do not require the addition of water. (3) The lead-acid battery is economical and has extensive application, but is heavier than an equivalent performance battery of an- other type. The battery is capable of a high rate of discharge and low temperature per- formance. However, maintaining a high rate of discharge for a period of time usually warps the cell plates, shorting out the battery. Its electrolyte has a moderate specific gravity, and state of charge can be checked with a hy- drometer. (4) Do not use high amperage automo- tive battery chargers to charge aircraft batteries. (5) NiCad vented batteries have a 1.2 volt nominal cell voltage. Occasional ad- dition of distilled water is required to replace water loss due to overcharging in normal service. Cause of failure is usually shorting or weakening of a cell. After replacing the bad cell with a good cell, the battery’s life can be extended for five or more years. Full dis- charge is not harmful to this type of battery. (6) NiCad sealed batteries are similar in most respects to NiCad vented batteries, but do not normally require the addition of water. Fully discharging the battery (to zero volts) may cause irreversible damage to one or more cells, leading to eventual battery failure due to low capacity. (7) The state of charge of a NiCad bat- tery cannot be determined by measuring the specific gravity of the potassium hydroxide electrolyte. The electrolyte specific gravity does not change with the state of charge. The only accurate way to determine the state of charge of a NiCad battery is by a measured discharge with a NiCad battery charger and following the manufacturer’s instructions. After the battery has been fully charged and allowed to stand for at least two hours, the fluid level may be adjusted, if necessary, using distilled or demineralized water. Because the fluid level varies with the state of charge, wa- ter should never be added while the battery is installed in the aircraft. Overfilling the battery will result in electrolyte spewage during charging. This will cause corrosive effects on the cell links, self-discharge of the battery, di- lution of the electrolyte density, possible blockage of the cell vents, and eventual cell rupture. (8) Lead-acid batteries are usually charged by regulated DC voltage sources. This allows maximum accumulation of charge in the early part of recharging. (9) Constant-current battery chargers are usually provided for NiCad batteries be- cause the NiCad cell voltage has a negative temperature coefficient. With a constant- voltage charging source, a NiCad battery Par 11-19 Page 11-7PDF Image | AFS-640
PDF Search Title:
AFS-640Original File Name Searched:
ac_43.13-1b_w-chg1.pdfDIY PDF Search: Google It | Yahoo | Bing
5,000 BF Shipping Container Lumber Dry Kiln For Quality Lumber The 5,000 BF container kiln consists of one 40 foot high-cube aluminum shipping container... More Info
Shipping Container Lumber Dry Kilns by Global Energy Global Energy designed and developed the container kiln back in 1991. The purpose is to give access to portable sawmill owners, furniture makers, and small business the value added profit of dry kiln lumber and quality hardwoods... More Info
Vacuum Kiln Conversion Kit for Lumber and Wood Dry Kilns Convert your existing conventional dry kiln into a fast drying vacuum kiln. Similar to vacuum bagging in the boat building and aircraft industry, we have come up with a proprietary process which allows you to build a very simple vacuum kiln at a fraction of the price, and without the intensive conventional metal chamber structure... More Info
Vacuum Pump Cart System for Bagging Clamping Wood Drying and more Vacuum Cart with 2HP Pump and Dual Pistons with multiple multiplex vacuum ports and liquid reservoir... More Info
Vacuum Bagging Basics Vacuum bagging is a method of clamping, which has traditionally been used in the composites industry, but can also be used for vacuum drying materials, including wood products... More Info
| CONTACT TEL: 608-238-6001 Email: greg@globalmicroturbine.com | RSS | AMP |