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Quick Reference→737 MAX
SAFETY BOUNDARY · ATA 29

Power removed ≠ zero hydraulic energy

Stopping the hydraulic pressure source is not automatically the same as depressurizing every part of the system.

737 MAX2 minall_levels

Safety boundary

The source treats hydraulic power removal and depressurization as separate concepts. Stored or trapped pressure can remain after a pump stops.

Never infer that a line/component is safe to open because the pump is OFF. Use the current approved task to establish the required zero-energy condition.

KEEP IN MIND
  • Pump OFF is not a zero-energy certificate
  • Residual/trapped pressure must be treated as stored energy
CONNECTED KNOWLEDGE

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B737 MAX ATA 29 — Power Transfer Unit (PTU): Functional Role and System Relationships

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B737 MAX ATA 29 — Standby Hydraulic System Explained

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B737 MAX ATA 29 — Pumps, Reservoirs and Pressure Sources

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B737 MAX ATA 29 — Hydraulic System Architecture and Energy Flow

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Build a durable mental model of Systems A and B, the standby system, pressure sources, reservoirs and the difference between hydraulic power removal …

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Quick Reference

Five questions before chasing a hydraulic component

Quick Reference · same ATA

A short reasoning checklist for separating source, hydraulic, indication and consumer evidence.

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BROADER RELATED TOPICS

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Discussion

What evidence should be stated before comparing 737 MAX messages across configurations?

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Discussion

Why should 737 MAX discussion remain separate from 737 NG assumptions?

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The aircraft families share lineage, but systems, messages and configuration can differ. Which habits prevent a useful 737 NG explanation from being …

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