Welcome Back

Sign in to your PART66Online account

or use email
Forgot password?

Don't have an account? Register here

Module 13. Aircraft aerodynamics, structures and systems

If on a lead-acid battery, several cell checks of SG read consistently low. Battery needs

  • recharging
  • replacing
  • topping up with distilled water

Explanation

Specific gravity falls as a lead-acid cell discharges because the sulphuric acid is consumed. Several cells reading consistently low SG indicate the battery is simply in a discharged state rather than faulty or low on water, so the correct action is to recharge it and then recheck the readings.

Jordi asking:

Shouldnt it be replacing?Because we've already performed several cell checks and it remains low .

Community Comments (0)

No one has posted a comment here yet.

Please Sign In to post a comment.

We use essential cookies to keep you signed in, plus anonymous analytics to understand how the site is used. Cookie-based analytics is set only with your consent. See our Privacy & Cookie Policy.