Winter Flying at Denham: Safety and Preparation
Understanding Winter Weather at Denham
Fog: The Winter Pilot's Constant Companion
Reading the Signs
Early morning checks of the actual weather at Denham are essential in winter. Do not rely solely on forecasts. A quick phone call to the airfield or a check of the webcam can save a wasted journey. We also recommend monitoring the dew point spread, as temperatures approaching the dew point are a reliable indicator of fog formation.
Low Cloud and Stratus
Aircraft Preparation: The Cold Weather Routine
The Pre-Flight Walk-Around in Winter
Never Assume
If the aircraft has been outside overnight during freezing conditions, assume there is ice somewhere. Water can collect in control rod ends, in the tail rotor servo, and in countless other locations. A thorough inspection is not optional.
Fuel System Considerations
Engine Starting and Warm-Up
The Patient Start
After starting on a cold day, resist the urge to increase RPM immediately. Allow the engine to idle for several minutes, monitoring oil pressure and temperature. On the R44 and R66, observe the warm-up procedures carefully before engaging the clutch. This patience pays dividends in engine longevity.
Carburettor Icing: The Invisible Threat
Prime Icing Conditions
The most dangerous carburettor icing conditions at Denham occur on mild, damp winter days with temperatures between 5 and 15 degrees Celsius and high humidity. These conditions feel comfortable and unthreatening, which is precisely why they catch pilots out. Be especially vigilant during descents when power is reduced.
Pilot Preparation: Looking After Yourself
Dressing for the Occasion
Wise Words
"There is no such thing as bad weather, only unsuitable clothing." This old Nordic saying applies perfectly to winter flying. Arrive prepared, and the cold becomes simply part of the experience rather than an ordeal to endure.
Cognitive Effects of Cold
Operational Considerations
The Short Winter Day
Ground Conditions
The Rewards of Winter Flying
Winter Flying Essentials
- Always check for frost and ice on rotor blades, pitot/static systems, and control mechanisms before flight
- Carburettor ice can form between 0-20C with moisture present - use carb heat preventively
- Allow proper engine warm-up time and follow clutch engagement procedures precisely
- Dress appropriately in layers and protect extremities to maintain cognitive function
- Plan conservatively around the short daylight window and be prepared to postpone or divert
- Embrace the rewards: better performance, exceptional visibility, and quieter skies
Flying With Us This Winter
Stay Current
Winter is an excellent time to schedule a refresher flight if you have not flown for a while. The combination of potentially challenging conditions and possibly rusty skills is not ideal. A flight with one of our instructors can help you brush up on your procedures and build confidence before venturing out on your own.