Check of the Aircraft Electrical Grounding

TASK 20-28-00-720-012-A
Check of the Aircraft Electrical Grounding

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	MEGOHMETER MULTIRANGE
No specific	1	PLATE 1.2 M (4 FT) - STEEL, SQUARED

B. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-869-002-A	Table of the Maximum Permitted Resistance-Values

3. Job Set-up
Subtask 20-28-00-420-091-A

A. Equipment
(1) MEGOHMETER MULTIRANGE with the applicable leads and prods:

Set the megohmmeter range to a value that is higher than the maximum permitted value of the assembly that you will measure. Refer to (Ref. AMM TASK 20-28-00-869-002).
Set the tension to 500 VDC.

(2) PLATE 1.2 M (4 FT) - STEEL, SQUARED.

4. Procedure
Subtask 20-28-00-210-064-A

A. Measurement of the Resistance Value
(1) Put the PLATE 1.2 M (4 FT) - STEEL, SQUARED between the tires of the nose landing gear and the ground.
(2) Measure the resistance between the plate and the nose gear leg with a MEGOHMETER MULTIRANGE.

NOTE: This procedure is easier if you make the tire/plate contact moist.

(3) Make sure that the measured values are not higher than the maximum permitted resistance-values (Ref. AMM TASK 20-28-00-869-002).
(4) Remove the test equipment.

5. Close-up
Subtask 20-28-00-942-101-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.01 04:51:03 UTC