Both skills are Locate and explain. The procedure is the same for each.
The general procedure (S1, S2)
- Identify the aircraft and confirm the manual applies — model, effectivity, revision (GEN-B Procedures Procedure 1).
- Locate the servicing procedure by chapter and section.
- Read the whole procedure, including warnings, cautions and notes.
- Explain: the sequence, the quantities and concentrations, the equipment required, the precautions, and what happens to the waste.
Check — state the manual, revision and section. That is what the element assesses.
S1 — lavatory waste system servicing
What the explanation must cover:
- PPE first — eye and face protection, gloves (AF-O Concepts §3).
- Draining the tank into approved equipment, never onto the ground.
- Flushing and rinsing per the procedure.
- Recharging with the correct concentration of flush additive — concentration matters, and more is not better.
- Disposal, which is a regulated waste stream (GEN-G Concepts §6).
Check — name the concentration and where the waste goes. Both are part of the procedure and both are commonly omitted from an explanation.
S2 — potable water system servicing
What the explanation must cover:
- Sanitation — potable water servicing has hygiene requirements, and the equipment used for it is dedicated and never shared with waste servicing.
- Filling to the specified quantity, and the effect on weight and balance (GEN-C) — water is heavy and it is carried at a known arm.
- Draining for freeze protection where the aircraft will be cold-soaked.
- Drain mast heating, and why a frozen mast is a problem.
Check — potable and waste servicing equipment must never be interchanged, and a candidate who does not mention it has explained a procedure without its most important precaution.
License
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