NTSB Recommendations
The NTSB made several recommendations to the FAA, including requiring that "flight crew members and appropriate ground personnel responsible for the inspection of transport-category airplanes for wing contamination receive specific periodic training that will illustrate what contamination looks like and feels like on a wing and the amount of contamination that is detectable under different light conditions". They also ordered "airlines to establish a way to inform fight crews of the type of fluid and mixture used, the current moisture accumulation rate, and the available holdover time.”
With regard to the obstructions that the airplane collided with during the accident sequence, the NTSB ordered the modification or replacement of “all pump houses adjacent to Runway 13/31 so that they are not obstructions to airplanes”. They also ordered a study on the “feasibility of building a frangible ILS antenna array for LaGuardia Airport” Further, they ordered a review of Fokker F28-4000 passenger safety briefing cards "to ensure that they clearly and accurately depict the operation of the two types of forward cabin doors in both their normal and emergency modes and that they describe clearly and accurately how to remove the overwing emergency exit and cover."
Read more about this topic: USAir Flight 405, Aftermath