Lesson 1f - Release Mechanisms

Lesson Objective

The instructor will teach the student/candidate the function of the tow release, including the differences in the Schweizer and Tost release mechanisms

Regulatory Requirement

• Pre-solo pilot: §61.87(i)(1)
• Private Pilot Test Candidate PTS II-C

Content

• Nose hook/CG hook
• Schweizer release
• Tost release
• Back-release function of CG hooks
• Maximum and Minimum towline strengths
• Use of weak links (towplane end, glider end)
• Hazards of hooking Tost rings onto Schweizer hooks
• POH maximum line strength vs the 200% rule

Completion Standards

The student must be able to: 

• Calculate the appropriate towline strengths
• Describe the proper use of weak links
• Recognize the correct usage of Schweizer or Tost rings for the appropriate aircraft
• Recognize the correct engagement of the Schweizer tow hook for Schweizer aircraft

Prerequisite Study

• Glider Flying Handbook (2013), Chapter 6, Page 6-6 
• Glider Flying Handbook (2013), Chapter 7, Page 7-11, figure 7-13
• 14 CFR § 91.309 Towing: Gliders and unpowered ultralight vehicles.