Piaggio P.136 “Royal Gull” technical manuals
A focused historical reference collection for the Piaggio P.136 amphibious flying boat, marketed in North America by Trecker Aircraft Corporation as the “Royal Gull”. The collection covers the L1 and L2 variants and brings together seven unique manuals, including aircraft handbooks, flight material, an FAA aircraft specification, a service bulletin, an engine parts catalogue, and illustrated parts information.
Collection contents
- P.136-L1 Royal Gull Aircraft Handbook, Manuale dell’aeromobile Royal Gull P.136 L1, English
- P.136-L1 Trecker Gull Amphibian Flight Manual, Manuale di volo dell’anfibio Trecker Gull, English
- P.136-L/P.136-L1/P.136-L2 FAA Aircraft Specification No. A-813, English
- P.136-L1/L2 Trecker Aircraft Corporation Service Bulletin No. 21, English
- Lycoming GSO 480 A Aircraft Engine Illustrated Parts Catalogue, English
- P.136 Amphibian Aircraft Description and Flight Manual, Descrizione e Norme di Pilotaggio, English
- P.136 Aircraft Illustrated Parts Catalog Manual, Volume 3, Catalogo Nomenclatore Illustrato delle Parti di Ricambio, Italian
Comparative technical reference
A supplied engineering evaluation report compares the military P.136F coastal patrol and search-and-rescue configuration with the civil P.136-L2 “Super Royal Gull”. The report presents the P.136F with twin Franklin 6A8-215-B9F engines rated at approximately 215 hp each, and the L2 with twin supercharged Lycoming GSO-480 engines rated at approximately 340 hp each. It also discusses differences in propeller systems, mission equipment, cabin configuration, gross weight and handling characteristics.
The report describes the P.136F as a utility-focused configuration with observation ports, medical-evacuation accommodation and communications equipment, while the civil L2 is described with a five-seat executive cabin, acoustic and vibration treatment, and cabin heating. Its handling discussion contrasts the higher torque and adverse-yaw characteristics attributed to the L2 with the lighter, lower-powered P.136F, and compares their water-run and hull-step behavior.
Reference figures supplied for the civil P.136-L2 / Royal Gull include an approximate maximum cruise speed of 181 knots, service ceiling of 25,600 feet, maximum range of 783–900 nautical miles, and maximum takeoff weight of 6,603 lb. These figures are historical reference data from the supplied reports, not independently verified operating limitations.
Historical reference notice
This collection is intended for aviation history, research, restoration and archival study. It is not current approved airworthiness data, operating approval or maintenance authorization. Users must verify applicability, provenance, rights and current official guidance before relying on any document for an aircraft or engine. The supplied comparative evaluation is summarized for context and is not counted as an additional manual in the seven-document manifest. Rights and provenance for any confidential or proprietary source material must be cleared before publication or distribution.