Todays observation,
A320's QRH
A fuel leak may be detected, if:
‐ The sum of FOB and FU significantly less than FOB at engine start or is decreasing, or
‐ A passenger observes fuel spray from engine/pylon or wingtip/sharklet, or
‐ The total fuel quantity is decreasing at an abnormal rate, or
‐ A fuel imbalance is developing, or
‐ Fuel quantity in a tank is decreasing too fast (leak from engine/pylon, or hole in a tank), or
‐ The Fuel flow is excessive (leak from engine), or
‐ Fuel is smelt in the cabin.
‐ The destination EFOB turns to amber on the F.PLN (or on the FUEL PRED) page, or
‐ ″DEST EFOB BELOW MIN″ appears on the MCDU scratchpad.
A321's QRH
A fuel leak may be detected, if:
‐ The sum of FOB and FU significantly less than FOB at engine start or is decreasing, or
‐ A passenger observes fuel spray from engine/pylon or wingtip/sharklet, or
‐ The total fuel quantity is decreasing at an abnormal rate, or
‐ A fuel imbalance is developing, or
‐ Fuel quantity in a tank is decreasing too fast (leak from engine/pylon, or hole in a tank), or
‐ A tank is overflowing (due to pipe rupture in a tank), or
‐ The Fuel flow is excessive (leak from engine), or
‐ Fuel is smelt in the cabin.
‐ The destination EFOB turns to amber on the F.PLN (or on the FUEL PRED) page, or
‐ ″DEST EFOB BELOW MIN″ appears on the MCDU scratchpad.
Item in bold, is missing in the A320's. Mindblowing...
Just thinking that this note was supposed to be for the A320's fleet and not the A321s?
Putting facts down,
We are talking about fuel from the center tank supposed to flow to an engine, and due to a rupture it finally fills the respective inner tank with the risk or overflowing.
In my opinion, such a rupture would be possible in the 320's only.
A rupture in the pipes that could result in overflowing inner tank fuel is not possible in 321's, as 321's dont have such pipes in the inner tanks. Fuel is transfered with the help of jet pumps, and engines are fed directly from the wing tank pumps.
