Browse Learn C1131

Seals and Sealing System Design of Actuation Systems in Military and Commercial Aircraft C1131

This four hour short course intends to present an overview of seals and sealing system design for military and commercial aircraft. It is aimed to provide engineers having some previous actuator and control valve design background with an understanding of the general hardware groove standards, standard parts for static applications and how seal designs and sealing systems can be best used in dynamic reciprocating and rotary applications. Information will be provided regarding seal material and fluid compatibility, friction drag, expected wear rates depending on operating conditions and duty cycle, hardware surface finish and topography. Also included will be information on seal installation procedures and potential pitfalls to avoid.

Learning Objectives
By attending this seminar, you will be able to:
  • Identify the standards relevant to seals and seal systems
  • Summarize key characteristics of dynamic reciprocating applications
  • Summarize key characteristics of rotary applications
  • Evaluate seal material characteristics and proper applications

Who Should Attend
This seminar is designed for engineers and other key personnel with some actuator and control valve design knowledge.

Attendees should have some previous actuator and control valve design experience.

  • First O-Ring Patent
    • 1932-Niels A. Christensen
  • Parker: Development of Range of Sizes
    • Tables
  • AS568
    • Range of sizes
    • Cross sections
    • Tolerances to Class 2- Tables
  • History and Application of Aerospace Gland Dimensional Standards for Seals and
  • Scrapers
    • MIL-P-5514 Revs A and B
    • MIL-P-5514 Revs C, D, and E
    • MIL-G-5514 Rev F
    • AS4716, AS5857, MS33675, AS4088, AS4052
  • History of Backup Ring Standards
    • MIL-R-8791, MS28774, MS27595, MS28782, MS28783
    • AS8791, AS5781, AS5782, AS5860, AS5861
  • EPDM History and Applications
    • NAS1613, NAS1611, NAS1612, AECMA specs
    • prEN 6111, prEN 6075, prEN6076
  • Elastomer Materials and Applications
    • In red oils
    • In fuels
    • In turbine oils
    • Properties
  • Storage of Elastomers
    • ARP5316
  • Plastic Materials and Applications
    • AMS3678 and slash sheets
    • Effects of fillers on PTFE materials
  • High Modulus Plastics
    • PEEK
    • PEKEKK
    • Carbon fiber composites
    • Properties and uses
  • Reciprocating Seals for AS4716 grooves
  • Piston Seals
    • Bi-directional - to fit std. and non-std grooves - examples
    • Uni-directional - to fit std. and non-std grooves - examples
  • Rod Seals
    • Bi-directional - to fit std. and non-std grooves - examples
    • Uni-Directional - to fit std. and non-std grooves - examples
  • Scrapers for MS33675, AS4088, and AS4052
  • Reciprocating Sealing Systems
    • Tandem and tertiary sealing systems with scrapers
  • Face Seals
    • Types for internal and external pressure
  • Seal Design Notes: An Appreciation
    • Low temperature considerations
    • High temperature considerations
    • Friction calculations: C of F for PTFE compounds
    • Friction calculations: Elastomers
    • Consideration of elastomer shear strength
    • Consideration of elastomer tensile strength
    • Consideration of elastomer elongation percentage
    • Thermal cycling: Reciprocating PTFE seal components
  • Rotary shaft seals
    • Metal can types: Elastomeric lip(s)
    • Metal can types: PTFE lip(s)
    • Flanged spring energized seals: Thermal cycling
  • Hardware Surfaces, Coatings, and Roughness Finishes
    • Dynamic
    • Static
  • Installation Tools and Procedures
    • For piston seals
    • For rod seals
  • Hardware Design Tips: Avoiding Installation and Performance Catastrophes
  • Pump/Motor Function Applications
Alan Schofield

Alan Schofield is an active consultant for Greene, Tweed & Co., where he recently retired as Global Director of Engineering. With global responsibility for the engineering function of the organization's five business groups, as well as the Central Engineering function, Mr. Schofield was in charge of the management of all aspects of engineering design, product and material development covering applications engineering, R&D, validation, and in-service engineering support of all products. The Global Engineering function consisted of 118 engineers and support staff distributed over 10 sites in the USA, UK, France, Germany, Japan and Singapore. Mr. Schofield was also Aerospace Engineering Manager prior to his appointment as Global Director. Prior to that he was with Coorstek as Director of Engineering Sales and Marketing, at Fluorocarbon Co. (now St. Gobain) as Seals Product Manager, at Shamban Intl. as Engineering Manager , and at W. S. Shamban & Co. (now Trelleborg) as Sales Engineer. The holder of three U.S. patents involving seal design and application, Mr. Schofield presently serves on the Steering Council for the SAE-A6 Fluid Power, Actuation and Control Technology Committee. Additionally, he also represented Airbus on the SAE-A6C2 Seals Panel, serving as Panel Chair for eight years and Secretary for six years. He has also served as a member of the SAE- AMS Committee P (Polymers) for twenty-three years and the AMS Committee CE (Elastomers) for fourteen years. During his participation in SAE committees, Mr. Schofield has acted as sponsor for twenty-two document reviews and sponsor for the publication of six new documents. Mr. Schofield received his B.S. in Mechanical Engineering in the UK.

Hotel & Travel Information

Fees: $325.00
SAE Members: $325.00 - $325.00

.4 CEUs
You must complete all course contact hours and successfully pass the learning assessment to obtain CEUs.

For additional information, contact SAE Customer Service 1-877-606-7323 (724-776-4970 outside the U.S. and Canada) or at

Duration: .5 Day
Upcoming open enrollment dates being scheduled. Please check back.