Zibo 737 VNAV problems

[yes]

When i reach the T/D mark for the first few seconds the speed drops down to calculated descend speed but then after few seconds it resets and i get the ARM message on the left DU

[🐉 Ðŗąçø 🐉]

Did you insert your desired altitude on the MCP (autopilot panel)?

[yes]

Messaggio originale di 🐉 Ðŗąçø 🐉:

Did you insert your desired altitude on the MCP (autopilot panel)?

25000 on mcp, but when it comes close to descent, i get a message on my fmc telling me to reset my mcp altitude

[🐉 Ðŗąçø 🐉]

Messaggio originale di Jestro`:

Messaggio originale di 🐉 Ðŗąçø 🐉:

Did you insert your desired altitude on the MCP (autopilot panel)?

25000 on mcp, but when it comes close to descent, i get a message on my fmc telling me to reset my mcp altitude

That basically means it can't descent because it can't go below that altitude. Dial in whatever altitude is next before you reach T/D, and it should start the descent. If not, press DES NOW on the descent forecast page in the FMC, or press LVL CHG and then VNAV.

[yes]

Messaggio originale di 🐉 Ðŗąçø 🐉:

Messaggio originale di Jestro`:

25000 on mcp, but when it comes close to descent, i get a message on my fmc telling me to reset my mcp altitude

That basically means it can't descent because it can't go below that altitude. Dial in whatever altitude is next before you reach T/D, and it should start the descent. If not, press DES NOW on the descent forecast page in the FMC, or press LVL CHG and then VNAV.

Could the problem be because i keep forgeting to input approach ref into fmc?

[🐉 Ðŗąçø 🐉]

Messaggio originale di Jestro`:

Messaggio originale di 🐉 Ðŗąçø 🐉:

That basically means it can't descent because it can't go below that altitude. Dial in whatever altitude is next before you reach T/D, and it should start the descent. If not, press DES NOW on the descent forecast page in the FMC, or press LVL CHG and then VNAV.

Could the problem be because i keep forgeting to input approach ref into fmc?

Lack of automated descent should only be casued by either not having a T/D forecast (or T/D symbol on ND) or forgetting reset MCP altitude.

[yes]

Messaggio originale di 🐉 Ðŗąçø 🐉:

Messaggio originale di Jestro`:

Could the problem be because i keep forgeting to input approach ref into fmc?

Lack of automated descent should only be casued by either not having a T/D forecast (or T/D symbol on ND) or forgetting reset MCP altitude.

There is a T/D simbol on the ND, I reset the altitude like few nm beforehand and it starts to descend straight away, once it descends the speed changes to assigned speed on the leg page in fmc but straight after few seconds the throttle jumps to full speed and changes from FMC speed to ARM on PFD. Used to fly PMDG on FSX and it was acting normal.