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Safety and emergency equipment

STC ST735SO

FAA DRS lists ST735SO as Current · Surrendered, held by Derlan Inc, for McDonnell Douglas DC-9-31, McDonnell Douglas DC-9-41, and McDonnell Douglas DC-9-34F, and 12 more aircraft configurations. Recorded change: Installation of protective rigid cover over the tail cone emergency evacuation slide. Snapshot dated June 30, 2026.

FAA-listed holder
Derlan Inc
Aircraft configurations
15
FAA revision date
FAA status
Current · Surrendered

Recorded modification

What the FAA record covers

Installation of protective rigid cover over the tail cone emergency evacuation slide.

ST735SO identifies the approval, recorded holder, named aircraft, and modification scope. It does not confirm kit availability, serial-number effectivity, data rights, price, or installation authority.

Applicability

Aircraft named in FAA DRS

Named aircraft: McDonnell Douglas DC-9-31, McDonnell Douglas DC-9-41, and McDonnell Douglas DC-9-34F, and 12 more aircraft configurations. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

McDonnell Douglas DC-9-31A6WEMcDonnell Douglas DC-9-41A6WEMcDonnell Douglas DC-9-34FA6WEMcDonnell Douglas DC-9-34A6WEMcDonnell Douglas DC-9-33FA6WEMcDonnell Douglas DC-9-51A6WEMcDonnell Douglas DC-9-32A6WEMcDonnell Douglas DC-9-11A6WEMcDonnell Douglas DC-9-21A6WEMcDonnell Douglas DC-9-15FA6WEMcDonnell Douglas DC-9-15A6WEMcDonnell Douglas DC-9-14A6WEMcDonnell Douglas DC-9-13A6WEMcDonnell Douglas DC-9-12A6WEMcDonnell Douglas DC-9-32FA6WE

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact McDonnell Douglas DC-9-31 and McDonnell Douglas DC-9-41, and 13 more aircraft configurations model, serial range, and configuration?
  2. 02Which equipment, inspection intervals, procedures, and limitations apply?
  3. 03Who can legally supply the design data, kit, instructions, and ICAs?
  4. 04What parts, labor, conformity, and return-to-service work are excluded?

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