In a slightly expanded version of Iloadmyself's response above, in response to Andy_Smith89UK:
It is unlikely that the pilot would lower the undercarriage at such a low altitude (approaching 400ft), unless he was already aware that he had to stretch the glide slope by keeping the aeroplane in a clean configuration, and there is no evidence of that (yet).
As state a couple of posts ago, lowering the undercarriage will greatly increase the drag, and if engine thrust and surplus airspeed are not available to counteract it, the rate of descent will increase.
Non Iron: None taken!
