What the profile screens for
Hydraulic pressure, quantity, temperature, pump, or warning status indicates a degraded system condition.
Why it matters
Hydraulic degradation can affect flight controls, gear, brakes, steering, spoilers, and other critical functions.
Build the event around relationships—not one number.
Define the operating context
Identify the taxi / takeoff / climb / cruise / descent / approach / landing state, aircraft configuration, location, and any required external data before applying logic.
Screen the signal relationship
Use validated combinations of hydraulic pressure, quantity, pump status; avoid treating one isolated value as the whole event.
Confirm it is a genuine event
Check polarity, units, source, recording rate, dropouts, air/ground logic, persistence, and false-positive mechanisms.
Connect data to the safety question
Review procedures, reports, weather, airport and traffic context, exposure, recurrence, and the strength of the related barriers.
Recorded signals that may help explain the event.
Ground spoiler position
Position or deployment state of panels used to reduce lift and increase wheel loading after touchdown.
Open parameter guide ↗psi, bar, or %Brake pressure
Hydraulic pressure or command associated with wheel braking; it is not a direct measurement of tyre/runway friction.
Open parameter guide ↗discreteLanding gear status
Command, position, lock, and ground-sensing states associated with the landing gear; these are separate signals with different meanings.
Open parameter guide ↗Questions before conclusions
- Q1
Are hydraulic pressure, quantity, pump status valid, correctly decoded, time-aligned, and sampled well enough for this event?
- Q2
What changed immediately before, during, and after the hydraulic-system warning or degradation indication?
- Q3
How do aircraft configuration, weather, airport geometry, automation state, and crew reports change the interpretation?
- Q4
Which current flight manual, SOP, maintenance, or operator event definition controls the final conclusion?
Safety topics that broaden the event review.
Flight-Deck Automation
Use mode awareness, active monitoring, and aircraft-response verification to keep automation aligned with crew intent.
Open topic brief ↗Aircraft SystemsEngine Failure and Thrust Loss
Separate commanded thrust, actual engine response, system effects, and crew management across partial, asymmetric, and complete thrust-loss events.
Open topic brief ↗Aircraft SystemsFire and Smoke
View fire safety as detection, containment, checklist action, diversion, evacuation, and rescue barriers.
Open topic brief ↗12 useful starting points
Terminology and topic relationships select these links; the publisher source remains authoritative.
SAFO 21003 — SAFO 21003, Inspection of Lavatory Fire Extinguishing Bottles on Aircraft Parked or Stored for a Prolonged Period of Time in a High-Temperature Environment
Official U.S. Federal Aviation Administration material indexed for fire and smoke and maintenance. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 18003 — SAFO 18003, Procedures for Addressing Odors, Smoke and/or Fumes In-Flight
Official U.S. Federal Aviation Administration material indexed for fire and smoke. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 16001 — SAFO 16001, Risks of Fire or Explosion when Transporting Lithium Ion or Lithium Metal Batteries as Cargo on Passenger and Cargo Aircraft
Official U.S. Federal Aviation Administration material indexed for fire and smoke and cabin and cargo. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 16011 — SAFO 16011, Air Transport Restrictions for Recalled Lithium Batteries and Lithium Battery Powered Devices
Official U.S. Federal Aviation Administration material indexed for fire and smoke. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 15003 — SAFO 15003, Fire Risk of Electronic Cigarettes (e-cigarettes) in Checked Baggage
Official U.S. Federal Aviation Administration material indexed for fire and smoke. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 14002 — SAFO 14002, Global Positioning System ( GPS )/Global Navigation Satellite System ( GNSS ) Navigator/Autopilot Compatibility
Official U.S. Federal Aviation Administration material indexed for flight controls and automation and navigation and surveillance. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 10004 — Contaminated Halon Fire Extinguishers
Official U.S. Federal Aviation Administration material indexed for fire and smoke. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 10021 — Adverse Levels of Porous Coke for All Engine and Oil Combinations
Official U.S. Federal Aviation Administration material indexed for powerplant. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 08005 — Preflight of helicopter hydraulic systems to include validation of control movement smoothness and identification of adverse flight control “stick-jump.”
Official U.S. Federal Aviation Administration material indexed for flight controls and automation and airworthiness and systems. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 08014 — Boeing 777 Extended Operations ( ETOPS ) Restrictions due to Cargo Fire Suppression System Shortfall
Official U.S. Federal Aviation Administration material indexed for fire and smoke and cabin and cargo. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 08015 — Preflight check of helicopter hydraulic systems to include validation of control movement smoothness and identification of adverse flight control “stick-jump”
Official U.S. Federal Aviation Administration material indexed for flight controls and automation and airworthiness and systems. Open the publisher source for the complete document, scope, and current status.
Open official sourceSAFO 08018 — Fire Handle Characteristics, DC-9, MD-80 and MD-90 Airplanes
Official U.S. Federal Aviation Administration material indexed for fire and smoke. Open the publisher source for the complete document, scope, and current status.
Open official source