I mainly fly the HondaJet, but assume this would apply to most jets.  When is the proper time to reduce throttle to MCT?  Right after takeoff (like at a certain altitude) or later?

Strikes me that this is an SOP question and that each Jet Manufacturer and or Airline would have SOP on managing thrust. 

-B

19 minutes ago, SpaceForceCapt said:

I mainly fly the HondaJet, but assume this would apply to most jets.  When is the proper time to reduce throttle to MCT?  Right after takeoff (like at a certain altitude) or later?

Manual says right after flaps are retracted, so pretty early in the takeoff procedure. So no, it's different from big jets.

EDIT: Just to explain - what is different is not that thrust is reduced after flaps retracted (on airliners it's much earlier), but that the flaps are retracted like 5 seconds after takeoff which is much earlier than in big jets.

Edited March 24, 20233 yr by Fiorentoni

 Not sure about biz jets, but in the airliner world there are different departure noise abatement procedures which direct us as to when to reduce thrust. As a rule of thumb, maintain V2+10 to V2+15 up until around 1,000 feet, then start accelerating to your climb speed...probably 250 knots or so. During that acceleration, retract your flaps on schedule. This is where you can decide to select your MCT or CLB thrust. As a rule of thumb, just wait till 1000 feet to reduce thrust. It doesn't particularly matter when you retract your flaps, as long as you're at the correct speed. You'll get to that speed "faster" if you keep your thrust up, then reduce your thrust to MCT/CLB thrust.

Here's how it'd look practically:

Scenario 1:
1) Takeoff
2) Maintain V2+10 until 1000 feet
3) Reduce Thrust to CLB/MCT at 1000 feet
4) Accelerate towards your climb speed
5) Retract flaps at the correct speed

Scenario 2:
1) Takeoff
2) Maintain V2+10 until 1000 feet
3) Accelerate towards your climb speed at 1000 feet
4) Retract flaps at the correct speed
5) Reduce Thrust to CLB/MCT once flaps are retracted

Scenario 3:
1) Takeoff
2) Maintain V2+10 until 3000 feet
3) Reduce Thrust to CLB/MCT at 1500 feet
4) Accelerate towards your climb speed at 3000 feet
5) Retract flaps at the correct speed

Edited March 24, 20233 yr by V1ROTA7E

Thanks, guys.  Sounds good.

5 hours ago, Fiorentoni said:

Manual says right after flaps are retracted, so pretty early in the takeoff procedure. So no, it's different from big jets.

Flaps in the Hjet and in most other aircraft are retracted based on specified airspeeds.  It is about speed, not about time!  Obviously if pitch is too great, target speed will be attained later rather than sooner.  However if pitch is too slight, speed will be attained sooner, but then altitude may be an issue in regard to safety.

 

Edited March 25, 20233 yr by fppilot

I take off with flaps at the halfway setting, and retract them very soon after TO.  I thought I read somewhere that it should be done at 400 ft, but not sure.