# SAIB CE-11-21: Flight Controls: Trailing Edge Flaps; Flap Nose Rib Cracking - Type: Special airworthiness information bulletin (advisory, not mandatory) - Status: Current - Revision: 0 - Issued: February 16, 2011 - Products: Hawker Beechcraft 35, 35-33, 35-A33, 35-B33, 35-C33, 35-C33A, 36, 56TC, 58, 58A, 58P, 58PA and 41 more - Product type: Aircraft, Small Airplane - PDF: https://openairdocs.org/files/sha256/bf/96/bf96a8dea53f57b622552f2e6181c45b4b3d7b25b1f7d1e35d3753d68c9a70cb - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1F5ED3B972B82FD0862578390057346F.0001 - DRS record last changed: February 16, 2011 - Page: https://openairdocs.org/saib/CE-11-21 ## Text Some pages are OCR from the scanned FAA bulletin. OCR can misread letters and numbers. FAA Aviation Safety **SPECIAL AIRWORTHINESS** INFORMATION BULLETIN SAIB: CE-11-21 SUBJ: Flight Controls: Trailing Edge Flaps; Flap Nose Rib Cracking Date: February 16, 2011 This is information only. Recommendations aren’t mandatory. Introduction This Special Airworthiness Information Bulletin (SAIB) is intended to inform you, owners, operators and maintenance personnel, of an airworthiness concern on Hawker Beechcraft Bonanza Model Series 33, 35, and 36; Baron Model Series 55, 56, 58, and 95; and Duke Model Series 60. Specifically, cracking could occur on the part number (P/N) 35-165050-84 flap nose rib. At this time, this airworthiness concern has not been determined to be an unsafe condition that would warrant airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39. Background In 2007, a pilot reported a split flap condition during flap extension and landed safely without incident. Inspection of the airplane by a 14 CFR part 145 repair station found the right-hand (R/H) flap rod attach bracket broken and the flap nose rib nut plate flange torn. Further inspection of the flap revealed cracking in the P/N 35-165050-84 nose rib. Inspection of the left-hand (L/H) side flap found similar damage. Six other airplanes were inspected by the repair station and found similar cracking to the P/N 35-165050-84 nose rib. Service difficulty reports were submitted for Hawker Beechcraft Models 35, 36, 55, and 95 aircraft in November 2007 and were published in Advisory Circular 43-16A, Aviation Maintenance Alerts, dated January 2008. These aircraft had flight hours between 4,000 and 6,500 hours. Similar reports of damage have been identified on airplanes with as few as 2,000 flight hours. Nose ribs of both the L/H and R/H flaps are prone to cracking. It is unknown at this time the exact cause of the cracking. See Figure 1 for examples of cracks in the P/N 35-165050-84 nose rib. Recommendations Hawker Beechcraft Corporation has published Safety Communiqué No. 313, dated December 2010. In addition to the suggestions given by the Safety Communiqué, the FAA recommends the following:  Pay particular attention to this area during pre-flight inspections.  Inspect the up-stop bumper for proper rigging and nose rib for cracks during the annual inspection.  Since the R/H flap nose rib assembly is located in close proximity to the wing walk area, it is recommended to avoid stepping on the flap to reduce the stress on the nose rib. For Further Information Contact Adam Neubauer, Aerospace Engineer, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Wichita, Kansas 67209; phone: (316) 946-4156; fax: (316) 946-4107; e-mail: Adam.Neubauer@faa.gov. (Optional) For Related Service Information Contact Hawker Beechcraft Corporation, P.O. Box 85, Wichita, KS 67201; phone: (316) 676-3140 1 **BARON SHOWN, OTHER MODELS SIMILAR** **VIEW LOOKING DOWN ON** **FORWARD EDGE OF FLAP** **DETAIL A** **AREA OF POTENTIAL CRACKS** DETAIL B LEFT FLAP SHOWN - RIGHT FLAP TYPICAL Example of Crack in P/N 35-165050-84 Nose Rib Example of Torn Flange in P/N 35-165050-84 with Nutplate Missing Figure 1 2 ## Registered aircraft it may concern (OpenAirDocs) Registry models matched by make and model, the same way as ADs, most registered aircraft first. - [Beech A36](https://openairdocs.org/model/beech-a36): 1,907 registered aircraft (airframe model) - [Beech V35B](https://openairdocs.org/model/beech-v35b): 913 registered aircraft (airframe model) - [Beech 95-B55 (T42A)](https://openairdocs.org/model/beech-95-b55-t42a): 774 registered aircraft (airframe model) - [Beech 58](https://openairdocs.org/model/beech-58): 726 registered aircraft (airframe model) - [Beech S35](https://openairdocs.org/model/beech-s35): 459 registered aircraft (airframe model) - [Raytheon A36](https://openairdocs.org/model/raytheon-a36): 448 registered aircraft (airframe model) - [Beech V35](https://openairdocs.org/model/beech-v35): 425 registered aircraft (airframe model) - [Beech V35A](https://openairdocs.org/model/beech-v35a): 321 registered aircraft (airframe model) - [Beech P35](https://openairdocs.org/model/beech-p35): 319 registered aircraft (airframe model) - [Beech 58P](https://openairdocs.org/model/beech-58p): 298 registered aircraft (airframe model) - [Beech 35-B33](https://openairdocs.org/model/beech-35-b33): 291 registered aircraft (airframe model) - [Beech 35](https://openairdocs.org/model/beech-35): 266 registered aircraft (airframe model) - [Beech C35](https://openairdocs.org/model/beech-c35): 258 registered aircraft (airframe model) - [Beech K35](https://openairdocs.org/model/beech-k35): 237 registered aircraft (airframe model) - [Beech B36TC](https://openairdocs.org/model/beech-b36tc): 225 registered aircraft (airframe model) - [Beech M35](https://openairdocs.org/model/beech-m35): 225 registered aircraft (airframe model) - [Beech G35](https://openairdocs.org/model/beech-g35): 224 registered aircraft (airframe model) - [Beech H35](https://openairdocs.org/model/beech-h35): 224 registered aircraft (airframe model) - [Beech J35](https://openairdocs.org/model/beech-j35): 221 registered aircraft (airframe model) - [Beech E-55](https://openairdocs.org/model/beech-e-55): 215 registered aircraft (airframe model) - [Beech F35](https://openairdocs.org/model/beech-f35): 192 registered aircraft (airframe model) - [Raytheon 58](https://openairdocs.org/model/raytheon-58): 188 registered aircraft (airframe model) - [Beech B-60](https://openairdocs.org/model/beech-b-60): 186 registered aircraft (airframe model) - [Beech 35-C33](https://openairdocs.org/model/beech-35-c33): 185 registered aircraft (airframe model) - [Beech A36TC](https://openairdocs.org/model/beech-a36tc): 174 registered aircraft (airframe model) - [Beech N35](https://openairdocs.org/model/beech-n35): 167 registered aircraft (airframe model) - [Beech A35](https://openairdocs.org/model/beech-a35): 159 registered aircraft (airframe model) - [Beech 95-C55](https://openairdocs.org/model/beech-95-c55): 158 registered aircraft (airframe model) - [Beech B35](https://openairdocs.org/model/beech-b35): 148 registered aircraft (airframe model) - [Hawker Beechcraft G36](https://openairdocs.org/model/hawker-beechcraft-g36): 146 registered aircraft (airframe model) - [Beech D35](https://openairdocs.org/model/beech-d35): 142 registered aircraft (airframe model) - [Beech E35](https://openairdocs.org/model/beech-e35): 141 registered aircraft (airframe model) - [Beech 35-33](https://openairdocs.org/model/beech-35-33): 130 registered aircraft (airframe model) - [Beech D55](https://openairdocs.org/model/beech-d55): 119 registered aircraft (airframe model) - [Beech 35-C33A](https://openairdocs.org/model/beech-35-c33a): 113 registered aircraft (airframe model) - [Beech 36](https://openairdocs.org/model/beech-36): 111 registered aircraft (airframe model) - [Raytheon G36](https://openairdocs.org/model/raytheon-g36): 97 registered aircraft (airframe model) - [Beech 95](https://openairdocs.org/model/beech-95): 95 registered aircraft (airframe model) - [Beech 95-A55](https://openairdocs.org/model/beech-95-a55): 90 registered aircraft (airframe model) - [Beech 35-A33](https://openairdocs.org/model/beech-35-a33): 85 registered aircraft (airframe model) - [Textron G36](https://openairdocs.org/model/textron-g36): 84 registered aircraft (airframe model) - [Raytheon B36TC](https://openairdocs.org/model/raytheon-b36tc): 82 registered aircraft (airframe model) - [Beech 58TC](https://openairdocs.org/model/beech-58tc): 79 registered aircraft (airframe model) - [Beech 95-B55](https://openairdocs.org/model/beech-95-b55): 74 registered aircraft (airframe model) - [Beech E33](https://openairdocs.org/model/beech-e33): 63 registered aircraft (airframe model) - [Beech 95-55](https://openairdocs.org/model/beech-95-55): 53 registered aircraft (airframe model) - [Beechcraft G36](https://openairdocs.org/model/beechcraft-g36): 53 registered aircraft (airframe model) - [Beech E33A](https://openairdocs.org/model/beech-e33a): 51 registered aircraft (airframe model) - [Beech A60](https://openairdocs.org/model/beech-a60): 43 registered aircraft (airframe model) - [Beech 56TC](https://openairdocs.org/model/beech-56tc): 37 registered aircraft (airframe model) All 60: https://openairdocs.org/saib/CE-11-21/models.md --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.