Piper Arrow: Aircraft Protective Covers

Aircraft protective covers are specialized coverings designed to shield critical aircraft components from environmental hazards – including dust, moisture, insects, bird activity, UV radiation, and foreign object debris (FOD) – while the aircraft is parked, stored, or undergoing maintenance. Unprotected sensors, probes, engine openings, and other components are vulnerable to contamination that can compromise instrument accuracy, accelerate corrosion, and create potentially dangerous conditions in flight. Using the correct protective covers is a simple, low-cost investment that directly supports airworthiness, reduces maintenance costs, and helps operators maintain compliance with aviation safety and maintenance regulations.

Pitot probe covers are protective caps placed over the aircraft's pitot tubes – the forward-facing probes that measure ram air pressure for airspeed indication – whenever the aircraft is on the ground and not in active use. If a pitot tube is blocked by a nest, insect intrusion, ice, moisture, or debris, the airspeed indicator can produce dangerously erroneous readings during flight, potentially leading to loss of aircraft control. Several fatal aviation accidents have been directly attributed to contaminated or obstructed pitot probes, making high-quality, clearly marked pitot probe covers one of the most safety-critical components of any preflight routine. Covers from manufacturers such as Sesame Technologies feature high-visibility red construction and "Remove Before Flight" warning streamers to help prevent inadvertent departure with covers installed.

Static port covers protect the small flush-mounted openings on the aircraft fuselage that sense ambient atmospheric pressure for the pitot-static system – providing data to the altimeter, airspeed indicator, and vertical speed indicator. Insects, dirt, moisture, and other contaminants can block static ports, causing all three instruments to display incorrect readings simultaneously and creating a serious flight safety hazard. Like pitot probe covers, static port covers should be installed whenever the aircraft is parked and removed during every preflight inspection to verify that the ports are clear and unobstructed.

Static wicks – the small, rod-like devices attached to the trailing edges of control surfaces and wingtips – are designed to safely discharge static electricity that builds up on the aircraft during flight, preventing radio interference and protecting avionics from electrical discharge events. Static wick covers protect these delicate components from physical damage, contamination, and moisture intrusion during ground handling and storage. Without protection, static wicks can become damaged, corroded, or fouled, reducing their ability to dissipate static charge effectively and potentially degrading avionics performance. Quality static wick covers from Sesame Technologies are lightweight, easy to install and remove, and manufactured with high-visibility materials for quick preflight verification.

Angle-of-attack sensors measure the angle between the aircraft's chord line and the relative wind, feeding critical data to AOA indicators, stall warning systems, and fly-by-wire flight control computers in more advanced aircraft. Contamination or physical damage to an AOA vane can cause incorrect stall warnings – either failing to warn of an actual stall or triggering false warnings – both of which pose significant safety risks. Angle-of-attack covers protect these sensors from debris, insects, icing, and ground handling damage while the aircraft is on the ground. Sesame Technologies manufactures AOA covers specifically engineered to fit the most common vane-style sensors found on business jets, regional airliners, and military aircraft.

Total air temperature (TAT) sensors measure the temperature of air entering the aircraft's sensors, accounting for the kinetic heating effect of airflow, and provide data used in airspeed calculations, engine management, and icing detection systems. Ice detector sensors alert flight crews and automated systems when icing conditions are present, making their accuracy essential during IMC flight. Both sensor types are mounted externally on the fuselage and are vulnerable to contamination, impact damage, and thermal shock from heat cycles during ground operations. Sesame Technologies produces dedicated TAT and ice detector sensor covers – including the IDC-EX for ice detector sensors – made from heat-resistant materials and equipped with warning streamers to protect these precision instruments on the ground.

Aircraft engine covers encompass both intake shields – which cover the engine air inlet openings – and exhaust barriers – which cover the exhaust outlet – to prevent foreign object ingestion, bird and insect nesting, moisture accumulation, and debris contamination when the engine is not running. A bird or rodent nest in an engine intake or exhaust can cause catastrophic engine damage on startup, while moisture or debris in the inlet can damage compressor blades and fuel system components. Engine covers are particularly important for aircraft stored outdoors or in open hangars for extended periods. PJi offers engine intake shields and exhaust barriers from Sesame Technologies, designed to provide a secure, clearly marked barrier that is simple to install and unmistakable during preflight walkarounds.

TROV (temperature relief outlet valve) and PRV (pressure relief valve) covers are protective devices designed to cover the external outlet openings of aircraft hydraulic and pneumatic relief valves, preventing contamination by debris, moisture, and insects that could impair valve function. Relief valves are safety-critical components in aircraft hydraulic, pneumatic, and pressurization systems – a contaminated or obstructed valve may fail to relieve pressure properly, potentially leading to system over-pressurization or structural damage. Like all aircraft protective covers, TROV and PRV covers should be brightly marked and included in every preflight inspection checklist to ensure they are removed before flight.

Aircraft propeller covers protect composite and metal propeller blades from UV degradation, moisture absorption, surface oxidation, and physical damage from debris or accidental contact during ground operations and storage. Unprotected composite blades are particularly vulnerable to UV damage, which can degrade resin systems and reduce structural integrity over time. Wheel covers protect wheel assemblies, tires, and brake components from ultraviolet exposure, moisture, and debris that can cause rubber degradation, corrosion, and contamination of brake assemblies. Using propeller and wheel covers during storage and extended ground time is a cost-effective way to preserve these components and avoid premature replacement.

Aircraft protective covers should be selected based on aircraft type and specific component compatibility, using only covers approved or recommended by the component manufacturer or the aircraft OEM. Each cover should be clearly marked – typically in high-visibility red or orange with "Remove Before Flight" streamers – and tracked as part of a standardized preflight and post-flight checklist to eliminate the risk of departing with any cover in place. Covers themselves require periodic inspection for wear, fading, damage, and missing or degraded streamers, as a damaged or hard-to-see cover is a safety hazard in its own right. PJi stocks aircraft protective covers from Sesame Technologies, Nav-Aids, and Tronair to fit a wide range of general aviation, business aviation, and commercial aircraft applications.