Hangar Door Emergency Procedure: Manual Operation Without Power

Open hangar door

Door Problems Don’t Have to Mean Aircraft On Ground

“We have an AOG situation, our hangar door won’t open!” The simple solution – with a bottom rolling door – is that you can easily tow the door without breaking it. When a power outage strikes, time suddenly becomes the enemy – especially when your aircraft is grounded behind a hangar door that won’t budge. But with a Spec-Dor bottom rolling door there’s a simple, proven solution that keeps you in control, not stranded: you can safely tow the door open (or closed) without damaging the system.

When Power Goes Out, Be Prepared

Every operator dreads the “what now?” moment during a power loss. The risks aren’t just operational – liability, equipment damage, and safety concerns quickly come into play. That’s why knowing how your door system behaves in a no-power scenario is critical.

Not all doors are created equal. Before attempting to tow, it’s essential to understand your specific system:

  1. Evaluate the door system – Know your drive type, braking system, connection points, and section layout.
  2. Watch for tail doors – These can create dangerous twisting forces when towed.
  3. Size matters – Larger sections mean heavier loads and higher risk if towed improperly.
  4. Check rails and wheel diameter – Smaller wheels or uneven rails can lead to derailment.
  5. Understand the drive connection – Knowing where and how the drive attaches helps prevent internal damage.
  6. Confirm if the lead section tows the trailing section – Not all systems are designed this way.
  7. End stops – make sure you have them!

What Can Go Wrong Without the Right Plan

If you’ve ever seen a door towed the wrong way, you know how quickly things can turn ugly:

  • Worm gearboxes can explode
  • A door pulled at an angle can jump the track and come down like a fly swatter.
  • The drive chain or gears can snap under sudden stress.
  • Wheels can seize, straps can fail, and panels can tear away from their seals.
  • Even the power feed system can be ripped.
  • Brakes can be ground down.

All of this adds up to costly downtime – and potentially unsafe working conditions.

Safe Steps for Manual Door Operation

When you can’t rely on power, rely on procedure. These steps can turn a crisis into a controlled operation:

  1. Turn off all electrical power to the door before towing – even during an outage.
  2. Use a dedicated towing sling and pre-defined towing points.
  3. Practice the procedure in advance – like an emergency exit drill.
  4. Tow straight and slow – forces should remain parallel to the rail.
  5. Disconnect the drive/brake system before towing
  6. Inspect for track obstacles before and during towing.
  7. Have a spotter monitor the process for safety and alignment.
  8. Stop if a problem is detected
  9. Make sure to re-engage braking system after towing
Hanger door safety edges

At Spec-Dor, bottom rolling door systems are engineered with practical operation in mind – even when the power fails. Our robust track, wheel, and drive assemblies are designed to withstand towing loads safely when handled using proper procedure. Of particular note, Spec-Dor doors also have a dedicated tow point and a toggle handle to disengage the drive system easily. That means you stay operational, even when your facility goes dark.

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