So there’s a support topic discussing the B77W approach speed and pitch angle too low. But the discussion is lack of convincing comparison. I did some comparison between PC simulator and IRL operations, and I believe the approach speed is too low as well.
The easiest way to compare is to find a more professional simulator on PC. I choose the well-known PMDG model in this comparison. This test is based on this video: PMDG Japan Airlines 777-300ER from Tokyo to Hong Kong | VATSIM - YouTube
At 40:25 the FMC’s in the approach ref page, showing the Vref for flaps 30 is 138kt. In normal operations, the Vapp will be Vref+5, in this case 143kt, which he followed later. We can also read the gross weight when approaching: 214.7t, or 214,700kg.
At 49:39, the aircraft’s on short final, maintaining Vapp=143kt, and a pitch angle of 1.25 degrees. The PFD shows the aircraft is descending 700ft per minute.
When we put all those data together (214.7t load, Vapp=143kt, F30, pitch 1.25 degrees) in IF:
The aircraft is only descending -300ft per minute. In very short time I’m well above the glideslope.
In order to be on the glide, I have to maintain a negative pitch:
Some may argue that simulators all have flaws and errors. So here’s a comparison to real life operation. This test is based on this video: TOKYO HANEDA 22 | BOEING 777 LANDING 4K - YouTube
We can read from the cockpit placard that the registration is F-GZND, a B77W of Air France.
At 2:34, The instrument shows Flaps 30 (the bar on the left, same as in IF), the Vapp around 145kt, pitching up 0.5-1 degree, and descending 750ft per minute.
Since there’s lack of weight information, I’ll use the max landing weight 251,290kg to achieve highest Vapp as possible.
They also mentioned wind information:
When these conditions are applied in IF:
The difference still exists, though not as obvious as previous one. The aircraft is able to follow glideslope at correct v-speed, but only with zero pitch. If following 0.5-1 degree pitch as in the video, the aircraft will be above GS. Considering this is the max landing weight, which won’t often be this case normally, the difference will only gets bigger.
I’ve made several comparison with other variants of B777 as well, but the B77W differs most from IRL. I’m open to discussions and opinions, and if many agree with this, I hope the devs can investigate. After all I’ve never seen a video showing a B77W approaching with negative pitch…Unless I missed something.