Blue elevator servocontrol servovalve
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1) Several airlines have reported failures of the blue elevator servocontrol servovalves on various Airbus aircraft models. 2) The failures have resulted in loss of one elevator but the elevator remains controllable by the adjacent servocontrol. 3) Investigations found wear in the servovalve spring ball could induce a bias in the servoloop and lack of robustness in the standby servocontrol monitoring were contributing factors. A software update and servovalve design improvement are being implemented.
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Mobile Ad Hoc Network (MANET) is a self-organizing and flexible system. MANET systems manage sensitive data from many distinct applications in various domains. Its dynamic nature increases its vulnerability to numerous types of security threats. Many of the present approaches using indirect approaches provide false approximations of trust degrees. It is significantly required a good routing system that meets Quality of Service (QoS) standards and enhances network performance. In this paper purposed cluster-based trustworthy safe multipath routing (CTSMP-Routing) for mobile ad hoc networks (MANETs). Load balancing challenge is addressed by using a modified proportional topology optimization (MPTO) approach using geographical data related to network nodes. The Enhanced Seeker Search Optimization (ESSO) approach is used to compute trust degrees after the clustering phase considering numerous network constraints including node mobility, received signal strength, energy consumption, and cooperation rate. Assumed to be the service node, the node showing the highest degree of trust manages inter-cluster routing. We have developed a hybrid soft computing approach termed the multi-layer deep recurrent neural network (ML-DRNN) to enhance the optimal path-finding process. This method selects, among many routes between source and destination nodes, the best one quickly. The outcomes of this paper demonstrate that CTSMP-Routing provides effective protection against several attack paths within the MANET environment and displays better performance in regard to quality of service (QoS) requirements.Cadastral Maps
Cadastral MapsGoogle
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Preparation of cadastral maps based by Engineer Dungo Tizazu from Dire Dawa University Microwatt: Open Tiny Core, Big Possibilities
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Microwatt is a lightweight, open-source core based on the OpenPOWER ISA.
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Ideal for education, prototyping, and custom silicon development.
Fully open, it empowers developers to learn, modify, and innovate.Deep Learning for Natural Language Processing_FDP on 16 June 2025 MITS.pptx
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This gives an introduction to how NLP has evolved from the time of World War II till this date through the advances in approaches, architectures and word representations. From rule based approaches, it advanced to statistical approaches. from traditional machine learning algorithms it advanced to deep neural network architectures. Deep neural architectures include recurrent neural networks, long short term memory, gated recurrent units, seq2seq models, encoder decoder models, transformer architecture, upto large language models and vision language models which are multimodal in nature.FUNDAMENTALS OF COMPUTER ORGANIZATION AND ARCHITECTURE
FUNDAMENTALS OF COMPUTER ORGANIZATION AND ARCHITECTUREShabista Imam
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FUNDAMENTALS OF COMPUTER ORGANIZATION AND ARCHITECTURE
By : Mostafa Abd-El-Barr & Hesham El-Rewini:: wiley
A complete guidance bookLearning ¨C Types of Machine Learning ¨C Supervised Learning ¨C Unsupervised UNI...
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Learning ¨C Types of Machine Learning ¨C Supervised Learning ¨C Unsupervised Learning- semi supervised learning - The Brain and the Neuron ¨C Design a Learning System ¨C Perspectives and Issues in Machine Learning ¨C Concept Learning Task ¨C Concept Learning as Search ¨C Finding a Maximally Specific Hypothesis ¨C Version Spaces and the Candidate Elimination Algorithm
Introduction to Natural Language Processing - Stages in NLP Pipeline, Challen...
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Lecture delivered in 2021. This gives an introduction to Natural Language Processing. It describes the use cases of NLP in daily life. It discusses the stages in NLP Pipeline. It highlights the challenges involved covering the different levels of ambiguity that could arise. It also gives a brief note on the present scenario with the latest language models, tools and frameworks/libraries for NLP.Stay Safe Women Security Android App Project Report.pdf
Stay Safe Women Security Android App Project Report.pdfKamal Acharya
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Women¡¯s security is a critical issue in today¡¯s world and it¡¯s very much needed for every individual
to be acting over such an issue. This document describes a GPS based ¡°Women Security System''
that provides the combination of GPS devices as well as provide alerts and messages with an
emergency button trigger whenever somebody is in trouble They might not have so much time, all
that they have to do is generate a distress emergency signal by shaking up their phone. Our system
provides a realizable, cost effective solution to problem detection. Nowdays due to recently
happened cases such as rape by drivers or colleagues, burglary etc., women security, especially
women security has become the foremost priority of the world. System uses the Global Positioning
System (GPS) technology to find out the location of women. The information of women's position
provided by the device can be viewed on Google maps using Internet or specialized software. The
companies are looking for-ward to the security problem and require a system that will efficiently
evaluate the problem of women security working in night shifts, traveling alone. We focus on the
proposed model that can be used to deal with the security issue of women using GPS based tracking
systems.Abraham Silberschatz-Operating System Concepts (9th,2012.12).pdf
Abraham Silberschatz-Operating System Concepts (9th,2012.12).pdfShabista Imam
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Complete book of operating system edition 9Rapid Prototyping for XR: Lecture 6 - AI for Prototyping and Research Directi...
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This is lecture 6 in the course on Rapid Prototyping for XR, taught on June 13th, 2025 by Mark Billinghurst. This lecture was about using AI for Prototyping and Research Directions. Proposal for folders structure division in projects.pdf
Proposal for folders structure division in projects.pdfMohamed Ahmed
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Proposal for folders structure division in projectsAd
Blue elevator servocontrol servovalve
- 1. BLUE ELEVATOR SERVOCONTROL SERVOVALVE FAILURES Reference: 27.34.51.014 First Issue Date: 30-APR-2009 Last Publication Date: 18-JUN-2015 Status: Open ATA: 27-34 A/C Type : A318 ; A319 ; A320 ; A321 Affected Part Number: A68793-002 Supplier : MOOG CONTROLS LIMITED; GOODRICH ACTUATION SYSTEMS SAS FIN : 34CE3 ; 34CE4 Potential Impact: Operational Reliability Linked Documentation: SB 27-1234 ; SB 27-1238 ; VSB 394512B-27-025 ; VSB 394512B-27-030 Engineering Support
- 2. First Issue Date: 30-APR-2009 Last Publication Date: 18-JUN-2015 Status: Closed Fault Code/ECAM Warning: ELAC1-COM OR WIRING TO L B ELEV SERVO VLV 34CE3 ; ELAC2-COM OR WIRING TO L G ELEV SERVO VLV 34CE1 ; ELAC1-COM OR WIRING TO R B ELEV SERVO VLV 34CE4 ; ELAC2-COM OR WIRING TO R Y ELEV SERVO VLV 34CE2 ; ELAC1-COM OR WIRING TO L B ELEV SERVO VLV 34CE3 ; ELAC2-COM OR WIRING TO L G ELEV SERVO VLV 34CE1 ; ELAC1-COM OR WIRING TO R B ELEV SERVO VLV 34CE4 ; ELAC2-COM OR WIRING TO R Y ELEV SERVO VLV 34CE2 Issue Description An increasing number of Airlines have reported the following failures: - F/CTL ELAC 1 PITCH FAULT associated with ELAC1 - COM OR WIRING TO L(R) B ELEV SERVO VLV 34CE3(4) - F/CTL ELEV SERVO FAULT associated with ELAC1 - COM OR WIRING TO L(R) B ELEV SERVO VLV 34CE3(4) or SEC1 - COM OR WIRING TO L(R) B ELEV SERVO VLV 34CE3(4) or L(R) B ELEV SERVO VLV 34CE3(4) In almost all the cases, servovalves (or complete servocontrol) replacements have enabled to fix the fault. Consequence Loss of one elevator servocontrol, which remains in damping mode. The elevator is still controlled with the adjacent servocontrol. Investigation Status The tests performed at Airbus laboratory with removed servocontrol or servovalves did not allow to reproduce the failure as experienced by airlines on aircraft. Nevertheless, the examinations performed by UTAS and Moog on several servovalves have shown non-conform wear of the spring ball, which induces a bias in the servoloop. Considering the results, such a defect alone, out of the aircraft environment, does not lead to the system fault detection and other contributors to the bias monitored by ELAC have been considered. ELAC functioning has been reviewed and specifically the servovalve monitoring on blue system by ELAC 1. - The inhibition of the servovalve natural bias compensation (as per today design) on the blue system has been identified as a potential contributing factor to the fault detection. - A drift of setting of the standby servocontrol LVDT with regard to the active one was suspected to be a contributor to the bias in the servoloop. However, recent flight tests on MSN001 and in lab have shown that the servocontrols misrigging did not permit to trigger the monitoring.
- 3. To date, two main contributors are considered: - Lack of robustness of the stand-by servocontrol monitoring (L B and R B servocontrols) performed by the ELAC1 is considered as the primary contributor to the servovalve fault detections. - Wear of the servovalve spring ball part has been identified. This wear, notably observed on servovalve Moog PN A68793-002, leads to a biais in the elevator servoloop, thus contributing to the servovalve fault detection if combined with the stand-by servocontrol monitoring described above. Moog will provide the shop report of the servovalves returned for repair upon request by the customer (to be mentioned in the PO). Mitigation / Interim Plan In case of F/CTL ELEV SERVO FAULT associated with ELAC1 - COM OR WIRING TO L(R) B ELEV SERVO VLV 34CE3(4) or SEC1 - COM OR WIRING TO L(R) B ELEV SERVO VLV 34CE3(4) or L(R) B ELEV SERVO VLV 34CE3(4)x, the servovalve shall be replaced directly. In case of "F/CTL ELAC 1 PITCH FAULT" ECAM warning triggered ON GROUND associated with ELAC1 - COM OR WIRING TO L(R) B ELEV SERVO VLV 34CE3(4), an ELAC reset can clear the fault if it is due to particular conditions (cold temperature, surface position at engine start). Nevertheless, if the same fault reoccurs within the next two days, the replacement of the servovalve is necessary to fix the fault. Maintenance Information Replace, as a first action, the servovalve (LRU) instead of the complete servocontrol. It is even advised to replace the servovalve before replacing the ELAC. Repercussion on A/C Dispatch "F/CTL ELEV SERVO FAULT" : No dispatch. "F/CTL ELAC 1 PITCH FAULT" : Refer to MMEL 27-93-01. Solution 1- ELAC software modification: An improvement of the elevator stand-by servocontrol monitoring has been developed. This will avoid numerous detections on blue actuators. The ELAC monitoring modification is available in the ELAC standard L97 which is compatible with sharklet (L95 standard being cancelled).
- 4. The In Service Evaluation (ISE) has been successfully completed. A fleetwide ELAC L97 retrofit has been launched from June 2014. This retrofit is supported by a RIL (Retrofit Information Letter) and associated Airbus SB A320-27-1234 (for ELAC B-dl with dataloading capability) and A320- 27-1238 (for ELAC B without dataloading capability). ELAC B / B-dl L97 retrofit has been superseded by ELAC L97+ retrofit from March 2015. Since March 2015, the ELAC A/A' are also replaced by ELAC B-dl with L97+ operational software loaded. Refer to RIL for exact commercial conditions. 2- Servovalve improvement: Studies at UTAS and Moog (servovalve supplier) are still in progress to correct the main identified failure modes affecting the spool position: null position bias out of tolerance, loose ball fit and LVT faults.
- 5. Retrofits Monitoring First Issue Date: 04-DEC-2014 Last Publication Date: 04-DEC-2014 Status: Open Retrofit Information Letter: YES
- 6. This modification is subject to an AIRBUS Monitored Retrofit. Airbus Retrofit Information Letter is available. It details retrofit process and material ordering. For a complete list of monitored retrofits applicable to your fleet, please contact monitored.retrofit@airbus.com. ? Airbus SAS, 2014. All rights reserved. Confidential and proprietary document.The technical information provided in this article is for convenience and information purposes only. It shall in no case replace the official Airbus technical or Flight Operations data which shall remain the sole basis for aircraft maintenance and operation. These recommendations and information do not constitute a contractual commitment, warranty or guarantee whatsoever. They shall not supersede the Airbus technical nor operational documentation; should any deviation appear between this article and the Airbus or airline's official manuals, the operator must ensure to cover it with the appropriate document such as TA, FCD, RAS. Access to WISE is supplied by Airbus under the express condition that Airbus hereby disclaims any and all liability for the use made by the user of the information contained in WISE. It shall be used for the user's own purposes only and shall not be reproduced or disclosed to any third party without the prior consent of Airbus.