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Which measures are recommended when operating an aircraft in a sand-laden atmosphere? (Select all that apply)
How often should the main rotor blades be checked for erosion in sandy conditions?
every 10 hours
The power plant sand filters should be cleaned every 50 hours.
False
Glycerin should be applied on the MRB before __________ the aircraft.
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What should be checked if the main rotor overspeed exceeds 440 rpm?
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What is the maximum main rotor speed before a detailed inspection is required?
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Match the following maintenance tasks with their frequency:
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It is acceptable to operate without cleaning the aircraft after extended hover over seawater.
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What should be installed to protect the power plant against erosion?
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It is recommended to clean the fuel filter of the aircraft fuel system every 20 hours.
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How often should the main rotor blades be checked for erosion?
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What should be done to the sand filters after every 25 hours?
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After an incident, a detailed inspection should be carried out on all parts, accessories, and _______.
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What is the action required if the main rotor overspeed exceeds 440 rpm?
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The condition of the anticorrosion beads should be checked every 50 hours.
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What oil should be used to grease doors, fairings, and panels during inspection?
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Which of the following is NOT recommended for maintenance in a sand-laden atmosphere?
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What applies to unpainted moving parts for protection?
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Study Notes
Operating in Sand-Laden Atmosphere
- Install sand filters to protect the power plant from erosion.
- Protect blade leading edges, when necessary.
- Blank air intakes and exhaust pipe after each flight.
- Limit power check ground runs to a minimum on sandy or dirty areas.
- Observe maintenance recommendations.
- Check main rotor blades for erosion every 10 hours, overriding intervals outlined in chapter 5.30 for normal conditions.
- Check tail rotor blades for erosion every 10 hours, particularly during intensive operation in very sandy atmospheres.
- Clean fuel filter of aircraft fuel system every 10 hours.
- Check power plant compressor turbine blades for erosion every 10 hours.
- Clean power plant sand filters every 25 hours.
- Clean heating system filter every 50 hours.
- Clean hoist filter every 50 hours.
- Apply a film of C-629 to unpainted fixed parts.
- Apply G-359 grease to unpainted moving parts.
- Clean metal surfaces such as skins, structural components, and casings.
- Protect electric plugs and connections.
- Inspect doors, fearing, and panels weekly during pre-flight. Clean these parts with spirit and then grease with H-515 oil.
- Flash power plant every 100 hours after extended hover or low-altitude flying over seawater, as per TUBOMECA's recommendations.
- Wash main rotor blades and coat with SI-4 compound every 25 hours after extended hover or low-altitude flying over seawater, as per W.C. No-57.10.701.
- Wash aircraft structure with fresh water weekly and after extended hover or low-altitude flying above seawater.
- Check condition of anticorrosion beads every 100 hours or 6 months.
- Visually check the non-rotating star control rods every 100 hours or 3 months, as per W.C. No- 40.11.601.
Starting Aircraft in Snow
- Remove air intake and exhaust nozzle protection after cleaning the aircraft before starting the engine.
- Remove snow or ice that has built up near the engine air intakes and on the air intake screens.
- Remove snow or ice that has built up inside the engine air intakes screens and inside air intakes ducts.
- Check for snow or frost on vents, static vents, drains, and scuppers.
- Apply glycerin to the main rotor blades before parking the aircraft.
Incidents and Accidents Inspections
- Conduct checks following a shock or damage to any part of the aircraft.
- Analyze possible consequences and determine necessary checks, encompassing not only the affected parts, but all parts, accessories, and components.
- Conduct inspections subsequent to such incidents.
- Investigate any non-compliance with or exceeding of operating limitations outlined in the manufacturer’s approved flight and maintenance manuals.
Main Rotor over Speed Inspection Procedures
- If main rotor speed exceeds 420 rpm but remains below 440 rpm:
- Remove main rotor blades and check skin bonding.
- Conduct a detailed inspection of the tail rotor hub.
- If rotor over speed reaches or exceeds 440 rpm:
- Follow the detailed inspection procedure outlined above.
- Remove main rotor hub and shaft and tail rotor head and return them to the factory for inspection.
Main Rotor Hub (MRH) Checks
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Verify the pitch change rods are true.
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Inspect for mutual interference between the upper and lower swash plates.
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Ensure rods beneath the swash plates are true.
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Confirm droop restrainers' bolts are true.
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Check the straightness of droop restrainer stop pins.
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Rejection Criteria: If any defects are found, reject the following:
- Defective parts
- Main rotor hub
- Pitch change levers
- Swash plates
- Rods beneath the swash plate
- Droop restrainer stop pins
Transmission Systems Checks
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Inspect transmission system assembly for twisting and warping.
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Check the condition of the shaft and universal joint assembly for warping and loose rivets.
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Rejection Criteria: If any defects are found, reject the following:
- Gearing on the main gearbox rear power output shaft.
- Lower flaired casing of the main gearbox pinion gear.
- Transmission drive shafts.
- Tail gearbox casing.
Additional Checks
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Conduct a detailed check of the following:
- Landing gear: buckled oleo, damaged oleo attachments
- Body structure
- Tail boom
- Engine mounting “A” frame
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Rejection Criteria: If one of these components is damaged, reject:
- Main gearbox “A” frame.
Operating an Aircraft in Sand-Laden Atmospheres
- Install sand filters to protect the powerplant from erosion.
- Protect blade leading edges when necessary.
- Blank air intakes and exhaust pipes after each flight.
- Minimize power check ground runs on sandy or dirty areas.
- Follow maintenance recommendations, and check main rotor blades for erosion every 10 hours. This interval overrides the normal schedule outlined in Chapter 5.30.
- Check tail rotor blades for erosion every 10 hours.
- Clean the aircraft fuel filter every 10 hours.
- Check the powerplant compressor turbine blades for erosion every 10 hours.
- Clean the powerplant sand filters every 25 hours.
- Clean the heating system filter every 50 hours.
- Clean the hoist filter every 50 hours.
- Apply C-629 film on unpainted fixed parts and G-359 grease on unpainted moving parts.
- Clean metal surfaces including skins, structural components, and casings.
- Protect electric plugs and connections.
- Inspect doors, fearing, and panels weekly during pre-flight, cleaning them with spirit then greasing with H-515 oil.
- Flash power plant every 100 hours after extended hover or low-altitude flying over seawater.
- Wash main rotor blades and coat with SI-4 compound every 25 hours after extended hover or low-altitude flying over seawater.
- Wash the aircraft structure with freshwater weekly and after extended hover or low-altitude flying over seawater.
- Check the condition of anticorrosion beads every 100 hours or 6 months.
- Visually check the non-rotating star control rods every 100 hours or 3 months.
Starting an Aircraft After Parking in Snow
- Remove air intake and exhaust nozzle protection after cleaning the aircraft before starting the engines.
- Carefully remove snow or ice near engine air intakes and on intake screens, as melting can cause damage or ingestion by the engine.
- Remove snow or ice buildup inside engine air intake screens and ducts, potentially requiring removal of the screen or cowlings.
- Ensure there's no snow or frost on vents, static vents, drains, and scuppers; clean them if necessary.
- Apply glycerin on the main rotor blades before parking the aircraft.
Typical Inspections: Incidents and Accidents
- Conduct inspections following any shock or damage to the aircraft, ensuring all parts are checked.
- Investigate incidents and accidents, analyzing the possible consequences and determining necessary checks.
- Implement inspections after non-compliance or exceeding operating limitations as outlined in the manufacturer's manuals.
Main Rotor Over-Speed
- Over 420 RPM but less than 440 RPM: Remove main rotor blades and check skin bonding. Carry out a detailed inspection of the tail rotor hub.
- Over 440 RPM: Implement the detailed inspection procedure for over 420 RPM, and remove the main rotor hub and shaft, as well as the tail rotor head, for factory inspection
Main Rotor Hub (MRH) Checks
- Ensure pitch change rods are true.
- Identify and check for any mutual interference between the upper and lower swash plates.
- Verify that the rods beneath the swash plates are true.
- Confirm the truth of droop restrainer bolts.
- Ensure the straightness of droop restrainer stop pins.
- Reject any defective parts, including the MRH, pitch change levers, swash plates, rods beneath the swash plate, and droop restrainer stop pins.
Transmission System Checks
- Identify and check for any twisting or warping in the transmission system assembly.
- Inspect the condition of the shaft and universal joint assembly for warping and loose rivets.
- Reject any defective components, including the M.G.B. rear power output shaft, lower flaired casing of the M.G.B. pinion gear, transmission drive shafts, and T.G.B. casing.
Additional Checks
- Conduct a detailed check of the landing gear (including the oleo and attachments), body structure, tail boom, and engine mounting "A" frame.
- Reject the M.G.B. "A" frame if any damage is found.
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Description
This quiz focuses on the essential maintenance procedures for aircraft operating in sand-laden atmospheres. It covers protective measures, cleaning protocols, and inspection schedules critical for ensuring performance and safety in challenging environments. Test your knowledge on maintaining aircraft components in sandy conditions.
