Pressure and Temperature in Aerospace Hydraulics

Hydraulic System Applications in Aerospace

As mentioned, hydraulic systems are vital to the operation of commercial and military aircraft and space vehicles, including:

• Cargo Doors
• Rudders
• Spoilers
• Landing gear
• Nose wheel steering 
• Primary flight controls
• Emergency generators
• Flap/slat drives

With regard to military aircraft there are many specialty applications for aerospace hydraulics, including: gun drives, hydraulic-motor-driven-fan heat exchangers and weapons-bay doors.

Pressure and Temperature

Internal and ambient pressure conditions, temperature extremes, materials, speed, weight, and fluid compatibility are some of the primary considerations in aircraft design.

The pressures within aircraft hydraulic systems are typically higher than most industrial applications. For instance most commercial planes run at 3,000 PSI, while most hydraulics in military aircraft operate from 4,000 to 5,000 PSI. These higher pressures are related to the need for light weight at higher altitudes as actuators generate higher torque forces and power.

Aircraft also deal with sometime unexpected variables of ambient temperature fluctuations that fall well below zero and over 100° F. Most commercial planes experience conditions from -65° to 160° F and military aircraft from -65° to 275° F.

This blog is an excerpt from our whitepaper, Aerospace Industry Supply Chain & the Critical Role of Hydraulics. Click the link below to download your free whitepaper! 

Primary Sources Include:

• Aerospace Engineering 
• Aerospace Export 
• Aerospace Industries Association (AIA)
• Aviation Week Network 
• Defense News 
• EE|Times 
• Hydraulics & Pneumatics 
• Industry Week 
• Post-Tier 1: The next era in aerospace supply chain evolution? 
• Processing 
• SKYbrary 
• Trade & Industry Development