General Flight Guidelines
- Upon being knocked down, maintain at least one power lever at flight idle.
- Awareness of radar altimeter is crucial, especially at critical heights like 500 feet and below.
- If flaps are up and one power lever is at idle, a low gear warning will trigger at 500 feet.
- No flaps and one power lever in idle will lead to a low flaps warning.
- Confirmation of landing gear existence is mandatory when below 500 feet using radar altimeter.
Operational Procedures
- Ensure to review aircraft systems in approach briefing before landing.
- Take note of any inoperative systems impacting flight operations, including emergency equipment.
- Emergency systems such as stick pusher and TCAS will be inoperative at altitude below 500 feet.
Flight Control Systems
Wheel Steering System
- The wheel steering is part of the blue hydraulic system providing directional control.
- Includes a bobbin valve and steering feedback mechanism similar to automotive systems.
- When the wheel is turned, feedback mechanism engages to manage hydraulic pressure.
- Protections are in place to prevent jammed nose wheel due to hydraulic failure when the landing gear is up.
- Includes solenoid valve that isolates the blue system pressure when weight is off wheels.
- Self-centering springs and mechanical swivel valves provide redundancies in the control system.
Incident Reference
- An incident involving American Airlines flight from O'Hare to Charleston illustrates mismanagement.
- The ramp crew mistakenly placed chocks in the wheel well leading to gear issues during taxi and takeoff.
- Crew managed a safe landing despite failure to deploy the right main gear.
Brake Systems and Safety Features
Brake Indicator Lights
- An FAA-required brake light activates for actual gear unsafe conditions.
- The indicator does not display during transit but activates when an unsafe condition is detected, like gear not being fully deployed.
Override Functions and Modifications
- Retract override switch available on some modified aircraft allows gear retraction even if the system inhibits retraction on the ground.
Anti-Skid System
- Anti-skid is inhibited below 10 knots to prevent jerking during taxi operations.
- The brake pressure becomes active only at speeds greater than 35 knots to prevent tire blowouts upon touchdown.
- The anti-skid system kicks in when speed reaches 23 knots, releasing brake pressure from the slower rotating wheel to ensure safety.
Touchdown Protection
- Touching down with brakes applied will inhibit brake pressure until speed increases to 35 knots to prevent tire damage.
- In the event of high energy landing scenarios, the brake system designed to prevent tire explosions by venting pressure if the brake temperatures exceed critical limits.
Temperature Management Procedures
Fusible Plugs and Safety
- Each wheel contains fusible plugs, which soften and release nitrogen pressure at temperatures exceeding 177°C (350°F) to prevent tire explosions.
- Brake temperatures are monitored via sensors; 160°C is the threshold for brake hot warnings, with fuse plugs ensuring safety above 177°C.
Operational Procedures on Emergency Scenarios
Parking Brake Protocols
- The emergency parking brake has a distinct notch; exceeding one centimeter past this can lead to catastrophic failure of tires and rims.
- Safety protocols stress caution when using the emergency brake, especially in unexpected scenarios such as hot brakes or high-speed landings.
Preparation for Landing
- Utilize data to assess required landing distance during approach adjustments; calculations must account for any inoperative brake systems.
General Operations and Preparation for Checkrides
Training and Checkride Preparations
- Importance of detailed knowledge of systems for oral examinations and practical checkrides emphasized.
- Review protocols in case of dual system failures to ensure safety and compliance with operational protocols.
Weight and Balance Assessment
- Conduct thorough weight and balance checks prior to flights, especially in conjunction with safety briefings.
Final Operational Considerations
Dealing with Altitude and System Failures
- In case of systems failure such as blue pressure loss, assess and adjust as required for safe landings.
- Max tire speed must be maintained, and typical operational ranges should be adhered to carefully.
Continuous Review and Update of Procedures
- Regular reviews of standard operating procedures (SOPs) stay updated for all pilots to ensure robust handling of potential issues.