Aircraft type: Messerschmitt Bf 109 E-1, E-3, E-4
System affected: Fuel system, Landing Gear Emergency System
Description of the problem: The emergency opening now works this way: you have to pull the emergency release lever (Fahrwerk Notzug), then have to use the nearby hand pump. This is wrong. That pump is connected to the fuel system, you can pressurize the fuel system with it (before engine start).
Description of proper operation:: You have to pull the "Fahrwerk Notzug" lever, and the gravity opens the landing gear, and locks in open position (It's working only, if the landing gear system lost the hydraulic pressure). No need any handpump.
Sources: Bf 109 E Betriebs- und Rüstanleitung, page 68, 69, 97
109 E Fuel system (top view)
This pump is the part of fuel system:
A single wire pulled by emergency lever, which pull a safetly lock
Shematic draw of the landing gear system (no handpump)
