ED Decision 2005/006/R
For each APU instrument either a placard or colour markings or an acceptable combination must be provided to convey information on the maximum and (where applicable) minimum operating limits. Colour coding must comply with the following:
(a) Each maximum and, if applicable, minimum safe operating limit must be marked with a red radial or a red line;
(b) Each normal operating range must be marked with a green arc or green line, not extending beyond the maximum and minimum safe limits;
(c) Each precautionary operating range must be marked with a yellow arc or a yellow line; and
(d) Each APU speed range that is restricted because of excessive vibration stresses must be marked with red arcs or red lines.
[Amdt 25/1]
CS 25J1551 Oil quantity indicator
ED Decision 2005/006/R
Each oil quantity indicator must be marked with enough increments to indicate readily and accurately the quantity of oil.
[Amdt 25/1]
CS 25J1557 Miscellaneous markings and placards
ED Decision 2005/006/R
(a) Reserved
(b) APU fluid filler openings. The following applies:
(1) Reserved
(2) Oil filler openings must be marked at or near the filler cover with the word "oil".
[Amdt 25/1]