Fabrication of Onboard Systems Model 200-253-00 (without load weigh) and Model 200-254-00 (with load weigh) Big Mouth Hook Kit and Model 200-290-00 (without load weigh) and Model 200-291-00 (with load weigh) 3.5KK Cargo Hook Kit View PDF on drs.faa.gov ↗

The STC PDF is authoritative: installation instructions, ICA requirements and limitations.